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 terms and then solve for the unknown variable.

Front

If 36 baseball cards cost $18, what is the cost per card?

Back

The cost per card is $0.50.

Front

If Troy has $9, how many baseball cards can he buy if each card costs $0.50?

Back

Troy can buy 18 baseball cards.

Front

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

Back

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

Front

Solve the proportion: 2/3 = x/12. What is x?

Back

x = 8.

Front

What does it mean to round an answer?

Back

Rounding an answer means adjusting the number to a nearby value that is easier to work with, often to a specified decimal place.

Front

If a proportion is set up as 4/x = 8/16, how do you solve for x?

Back

Cross-multiply to get 4 * 16 = 8 * x, then solve for x.

Front

What is the value of x in the proportion 5/x = 10/20?

Back

x = 10.

Front

How can you check if two ratios form a proportion?

Back

You can check by cross-multiplying and seeing if the products are equal.