Solving Proportions Review

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 variable.

Front

What does cross-multiplication involve?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If a/b = c/d, what is the cross-multiplication result?

Back

The result is ad = bc.

Front

What is the value of k in the proportion 5/k = 15/3?

Back

k = 1.

Front

How do you find the value of a variable in a proportion?

Back

Isolate the variable by using cross-multiplication and then solve the resulting equation.

Front

If 3 onions cost $2.50, how much does 1 onion cost?

Back

1 onion costs $0.83.

Front

If 1 Euro is worth 1.18 American Dollars, how much is 10 American Dollars worth in Euros?

Back

10 American Dollars is worth approximately 8.5 Euros.

Front

What is the formula for finding the unit rate?

Back

The unit rate is found by dividing the quantity by the number of units.

Front

If 4 apples cost $2, what is the cost per apple?

Back

The cost per apple is $0.50.