Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and set the products equal to each other.

Front

If 4 big water bottles hold 8 gallons, how much does 1 bottle hold?

Back

2 gallons.

Front

If 5 ice cream cones are sold for every 3 brownies, what is the ratio of ice cream cones to brownies?

Back

5:3.

Front

How do you find the unit rate?

Back

Divide the total quantity by the number of units.

Front

What is the unit rate of 120 miles in 3 hours?

Back

40 miles per hour.

Front

If 50 apples cost $25, what is the cost of 1 apple?

Back

$0.50.

Front

How do you find the cost of 75 apples if 50 apples cost $25?

Back

Set up a proportion: 50 apples/$25 = 75 apples/x, then solve for x.

Front

What is the cost of a slice of pizza if a pizza with 8 slices costs $12?

Back

$1.50.

Front

If a car travels 120 miles in 3 hours, how long will it take to travel 200 miles?

Back

5 hours.