Write and Solve Proportions

Solve using cross products 10 ounces for $3.50; 16 ounces for $X

$5.60

r/10 = 6/120

0.5

Find the value of the variable in the proportion b/12 = 2/24

1

Find the value of the variable in the proportion 2/3 = x/15

10

Solve using cross products 96 miles in 1 1/2 hours; p miles in 2 hours

128

Solve using cross products 7 miles in 4 hours; x miles in 8 hours

14

Find the value of the variable in the proportion 0.33/15 = w/100

2.2

Find the value of the variable in the proportion 5/3 = 45/x

27

Find the value of the variable in the proportion 12/d = 60/15

3

Find the value of the variable in the proportion 150/m = 125/5

6

Find the value of the variable in the proportion 13/39 = t/21

7

Find the value of the variable in the proportion 32/r = 96/24

8

Solve using cross products 216 cubic feet in h yards; 324 cubic feet in 12 yards

8

Solve using cross products 22 minutes to read 16 pages; t minutes to read 64 pages

88

Cross Products

Used when finding if ratios are proportional

When a number in a proportion is missing

you use equivalent ratios or cross products to find the missing number

Proportion

An equation stating that two ratios are equal