This document discusses ratios, proportions, and how to write them in simplest form. It provides examples of determining if a ratio is in simplest form, solving proportions, writing proportions based on relationships between quantities, and setting up a proportion to solve for an unknown quantity based on rates.

1. 3.5 Write Ratios and
Proportions

2. Vocabulary:
ratio: uses division to compare two quantities.
a to b a:b a
b
 ratios should be written in simplest form
proportion: an equation that states that two ratios
are equivalent (equal) a c
=
b d

3. Example 1: Tell if the ratio is in
simplest form
14 to 10 11 to 13

4. Example 2: Solve the proportion
11 x w 4
= =
6 30 35 7

5. more complicated….
b 9 m + 3 40
= =
0.5 2.5 8 64

6. Example 3: Write a proportion
5 is to 8 as x is to 9.
t is to 4 as 40 is to 28

7. Continue..
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