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

1 big water bottle holds 2 gallons.

Front

If a car travels 120 miles in 3 hours, what is its speed in miles per hour?

Back

The speed is 40 miles per hour.

Front

What is the unit rate?

Back

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

Front

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

Back

1 apple costs $0.50.

Front

How do you find the cost of multiple items using unit rate?

Back

Multiply the unit cost by the number of items.

Front

If 8 slices of pizza cost $12, what is the cost of 4 slices?

Back

4 slices cost $6.

Front

What is the formula for finding the missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

If x/4 = 3/12, what is the value of x?

Back

x = 1.