Name: ______________________________
LESSON
Class: _____________
Identifying & Writing Proportions
4-3
A proportion is two equal ratios.
9
6
.
Here are two ratios:
and
12
8
To find out if they are equal, reduce ratios to simplest form.
9
6
3
3


12
8
4
4
9
6
and
are equal ratios. They form a proportion.
12
8
4
5
and .
7
9
These ratios are in simplest form, but they are not equal.
4
5

7
9
4
5
and
are not equal ratios. They do not form a proportion.
7
9
Compare these two ratios:
Use the ratios
4
1
and
to answer Exercises 1–3.
6
3
4
to simplest form.
________________
6
4
1
2. Compare
and . Are they equal ratios?
6
3
1. Reduce
________________________________________________________________________________________
3. Do these two ratios form a proportion? Why or why not?
________________________________________________________________________________________
Use the ratios
4
2
and
for Exercises 4–6.
10
5
4
to simplest form. _________________
10
4
2
5. Compare
and
. Are they equal ratios?
10
5
4. Reduce
________________________________________________________________________________________
6. Do
4
2
and
form a proportion? Why or why not?
10
5