1. Write a proportion that compares hours of work to pay.
Solving Proportions
LESSON 7-4
Additional Examples
Janet earned $31.50 for 5 hours of work. How much does she earn for 7 hours of work at the same rate of pay?
Write a proportion that compares hours of work to pay.
Let p = the amount of pay.
Write a proportion.
hours
pay($) 5
31.50 7 p =
5 • p = • 7 Write the cross products.
5p = Multiply.
= Divide each side by 5. 5p 5
220.5
p = 44.1 Simplify.
Janet will earn $44.10 for 7 hours of work.

2. = Write the ratio as a fraction in simplest form.
Solving Proportions
LESSON 7-4
Additional Examples
Solve = . x 27 7 21
= Write the ratio as a fraction in
simplest form. 7 21 1 3 = x 27 1 3
3x = Since 3 × 9 = 27, x = 9.

3. = Start with the proportion.
Solving Proportions
LESSON 7-4
Additional Examples
Solve = . 14 26 21 n
= Start with the proportion. 14 26 21 n
14 • n = 26 • 21 Write the cross products.
14n = 546 Multiply.
= Divide each side by 14.
14n 14
546
n = 39 Simplify.