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 Hunter buys 36 baseball cards for $18, how much does each card cost?

Back

Each card costs $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 cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

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 the nearest whole number or specified decimal place.

Front

If 5/8 = x/32, what is x?

Back

x = 20.

Front

What is the value of x in the equation 3/x = 9/12?

Back

x = 4.

Front

How do you check if two ratios are proportional?

Back

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