Proportions

Front

What is a proportion?

Back

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

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the ratios and then solve for the unknown.

Front

If the ratio of height to width is 5:19 and the height is 2.5 inches, what is the width?

Back

9.5 inches.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together.

Front

If a dishwasher uses 32 gallons of water for 4 loads, how much water does it use per load?

Back

8 gallons per load.

Front

How do you find the total amount used based on a unit rate?

Back

Multiply the unit rate by the number of units.

Front

If a car travels 280 miles in 7 hours, what is its speed in miles per hour?

Back

40 miles per hour.

Front

How do you convert kilometers to miles?

Back

Multiply the number of kilometers by 0.621371.

Front

If 5 kilometers is about 3.1 miles, how many miles is 20 kilometers?

Back

12.4 miles.

Front

What is the formula for finding the time taken if you know the rate and distance?

Back

Time = Distance ÷ Rate.