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

Back

The ratio of ice cream cones to brownies is 5:3.

Front

If there are 24 brownies sold, how many ice cream cones are sold if the ratio is 5:3?

Back

40 ice cream cones are sold.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one.

Front

If a pizza costs $12 for 8 slices, what is the cost per slice?

Back

The cost per slice is $1.50.

Front

How do you find the cost of a different quantity of items based on a known cost?

Back

Use the unit rate to find the cost of one item, then multiply by the desired quantity.

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

How long will it take to travel 200 miles at a speed of 40 miles per hour?

Back

It will take 5 hours.

Front

What is the formula for finding the total cost based on unit price and quantity?

Back

Total Cost = Unit Price × Quantity.