Proportions Practice

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you set up a proportion to solve for an unknown?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are one ratio, and c and d are another ratio.

Front

What is the scale in a scale drawing?

Back

The scale in a scale drawing is the ratio of the drawing's dimensions to the actual dimensions.

Front

If a scale is 1 cm : 9 m, how do you convert actual measurements to the drawing?

Back

To convert actual measurements to the drawing, divide the actual measurement by the scale factor (9) to find the drawing measurement in centimeters.

Front

If a soccer field is 54 meters wide, how wide is it in a drawing with a scale of 1 cm : 9 m?

Back

6 cm (54 m ÷ 9 = 6 cm).

Front

What does a ratio of 3 to 2 mean?

Back

A ratio of 3 to 2 means that for every 3 units of one quantity, there are 2 units of another quantity.

Front

If there are 12 boys in a group with a ratio of boys to girls of 3 to 2, how many girls are there?

Back

8 girls (12 boys ÷ 3 = 4; 4 × 2 = 8).

Front

How do you find the total number of items in a ratio?

Back

Add the parts of the ratio together. For a ratio of 3 to 2, the total is 3 + 2 = 5 parts.

Front

If there are 21 cars and the ratio of cars to trucks is 3 to 4, how many trucks are there?

Back

28 trucks (21 cars ÷ 3 = 7; 7 × 4 = 28).

Front

What is the formula to find distance when speed and time are known?

Back

Distance = Speed × Time.