14_Solve_proportional_relationships.notebook
October 19, 2015
Topic: Ratios and Proportional Relationships
Aim: How do we set up proportions to solve real
life problems?
10/19/15
Try Now: Find the values of x that will make these
proportions true.
B
A
Jan 6­7:11 PM
Topic: Ratios and Proportional Relationships
Aim: How do we set up proportions to solve real life problems?
Let's explore something fascinating! Nonequivalent Ratios
Equivalent Ratios
Jan 6­7:11 PM
1
14_Solve_proportional_relationships.notebook
October 19, 2015
Topic: Ratios and Proportional Relationships
Aim: How do we set up proportions to solve real life problems?
A proportion is an equation that
states that two ratios are equivalent
[fraction = fraction]
In a proportion the product of the means
equals the product of the extremes.
Or more simply:
the cross products are equal.
(cross multiply)
• solve resulting equation
Example
ex
Example:
To solve a proportion:
• set the cross products equal to each other
me
an
s
es
m
tre
# 14
Solve Proportions
Example:
Jan 6­7:11 PM
Jan 6­7:11 PM
2
14_Solve_proportional_relationships.notebook
October 19, 2015
Topic: Ratios and Proportional Relationships
Aim: How do we set up proportions to solve real life problems?
Jan 6­7:11 PM
Topic: Ratios and Proportional Relationships
Aim: How do we set up proportions to solve real life problems?
Jan 6­7:11 PM
3