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..
A job requires an employee to be able to
type 120 words in 2 minutes. The employee
should be able to type x words in 7 minutes.