Name
LESSON
Date
Class
Practice C
5-3 Identifying and Writing Proportions
Determine whether the ratios are proportional.
7 42
1. 11, 60
10 38
, 2. 18 72
18 27
, 3. 28 42
6 15
4. 1
, 4 35
9 16
, 5. 24 40
12 20
, 6. 39 65
Find a ratio equivalent to each ratio. Then use the ratios to
write a proportion.
7
7. 3
1
24
8. 51
6
9. 29
14
17
11. 39
25
12. 32
10. 23
Complete each table of equivalent ratios.
13. 4 CDs to 10 tapes
CDs
Tapes
2
14. 9 triangles per 6 circles
10
10
28
Triangles
30
Circles
9
2
30
8
50
Find two ratios equivilent to each given ratio.
15. 10:21
16. 15:8
5
17. 24
18. 9
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
11
23
Holt Mathematics
Practice B
5-3 Identifying and Writing Proportions
Practice A
5-3 Identifying and Writing Proportions
LESSON
LESSON
Determine whether the ratios are proportional.
Write the ratios in simplest form. Determine if the ratios are
proportional by comparing them.
1 3
1. 4, 12
2 6
2. 3, 9
1 1
, ; yes
4 4
2 2
, ; yes
3 3
3 6
4. 6, 12
1 3
7. 3, 9
1 1
, ; yes
3 3
Find an equivalent ratio. Then write the proportion.
1
3
14. 4
5
1
10
2
4
7
12 20
6. 3
, 9 65
no
yes
Answers may vary.
Possible answers g
6
9. 2
9
48
24
102
51
14
17
11. 3
9
10. 23
14
42
23
69
6
24
29
116
25
100
32
128
8
6
and are proportional.
12
9
8
6
.
So, 9 12
4
3
and are not proportional.
10
8
4
3
So, 1
8.
0
6 9
2. 9, 15
105
21 105
yes
6
15
90
9
9
Are the ratios proportional?
12 5
4. 2
, 4 10
15 9
3. 6, 4
2
4
10
12
28
Triangles
3
9
12
30
75
5
10
25
30
70
Circles
2
6
8
20
50
60, 54, no
81
no
20 15
, 5. 12 9
answers given.
20:42; 40:84
16. 15:8
10 20
; 18 36
24
18. 9
120, 120, yes
9
93
3
12
12 3
4
30:16; 150:80
48 96
; 22 44
9
3
So, 1
4.
2
6
6. 1
0
10
7. 1
5
6
3
10
5
Copyright © by Holt, Rinehart and Winston.
9
94
36
12
12 4
48
9
36
So, 1
4
.
2
8
Find an equivalent ratio. Then write the proportion. Possible
11
23
180, 180, yes
You can write a proportion from a given ratio. Multiply or divide the
numerator and denominator of the ratio by the same number.
Find two ratios equivilent to each given ratio. Answers may vary. Possible
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
5
14. 9 triangles per 6 circles
Tapes
5
17. 4
3
and proportional?
Are 10
8
Find the cross products.
4 8 32 and 10 3 30
Since the cross products are not equal,
Are the ratios proportional?
CDs
15. 10:21
c
a
If a d b c, then b d .
a•d
8
6
proportional?
Are 9 and 1
2
Find the cross products.
6 12 72 and 9 8 72
Since the cross products are equal,
15 5
, 1. 21 7
15 7
Complete each table of equivalent ratios.
13. 4 CDs to 10 tapes
Holt Mathematics
Find the cross products to determine if the ratios are
proportional.
25
12. 3
2
17
34
39
78
b•c
a ? c
b d
yes
Find a ratio equivalent to each ratio. Then use the ratios to
write a proportion.
7
21
31
93
22
Two ratios that are equal form a proportion. To determine whether
two ratios are proportional, find the cross products of the ratios. If
the cross products are equal, then the ratios are proportional.
18 27
3. 2
, 8 42
24
8. 51
25
100
18
72
Review for Mastery
5-3 Identifying and Writing Proportions
no
7
7. 31
14
7
10
5
LESSON
Determine whether the ratios are proportional.
9 16
5. 2
, 4 40
25
18. 18
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Practice C
5-3 Identifying and Writing Proportions
14
28
15
30
14
17. 10
70
35
110
55
LESSON
no
11
110
12
120
35
Holt Mathematics
Answers may vary.
Possible answers giv
14
15. 15
12
16. 55
10
2
25
5
10 38
2. 1
, 8 72
no
11
14. 7
70
9
90
5
25
8
40
21
yes
no
3 10
12. 7, 2
1
yes
13. 9
10
18. 2
5
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
6 15
, 4. 14 35
no
Find a ratio equivalent to each ratio. Then use the ratios to
write a proportion.
5
15. 8
1
5
7
35
7 42
1. 11, 6
0
4 6
9. 9, 1
2
9 45
, 11. 10 50
yes
Answers may vary.
Possible answers given.
1
17. 7
4
2
6
3
yes
7 14
10. 8, 1
6
3 3
, ; yes
5 5
3
6
4
8
16. 6
no
7 13
, 8. 12 20
3 15
12. 5, 25
1 9
, ; no
2 20
13. 2
yes
4 6
, 7. 10 15
3 3
, ; yes
4 4
2 9
11. 4, 2
0
2 3
, ; no
3 5
7 24
6. 9, 2
7
3 18
9. 4, 24
2 7
, ; no
3 12
2 9
10. 3, 15
no
9 21
5. 6, 1
4
no
2 2
, ; yes
5 5
4 7
8. 6, 1
2
10 20
, 3. 12 32
yes
7 22
, 4. 10 30
2 6
6. 5, 15
5 8
, ; no
6 9
5 15
2. 6, 1
8
yes
4 3
, ; no
5 4
5 16
5. 6, 1
8
1 1
, ; yes
2 2
3 24
1. 4, 3
2
4 15
3. 5, 20
Holt Mathematics
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
91
answers given.
18
8. 24
10
20
15
30
24
18
3
24
4
Holt Mathematics
Holt Mathematics