Proportions

Front

If the Cross Products are equal, then....

Back

the two ratios are proportional.

Front

A 6 foot person casts a 2 foot shadow. A flagpole casts a 10 foot shadow. How tall is the flagpole?

Back

30 feet

Front

A model of a house was built using the scale 5 in:25 ft. If a window in the model is 1.5 in. wide, how wide is the actual window?

Back

7.5 ft

Front

A 12 ounce shampoo bottle lasts Mike 16 weeks. How long would an 18-ounce bottle of the same brand last him?

Back

24 weeks

Front

Determine whether each pair of ratios forms a proportion: 1/2 and 2/4

Back

Proportion

Front

What is a proportion?

Back

A statement that two ratios are equal.

Front

How do you find if two ratios are proportional?

Back

Cross multiply and check if the products are equal.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

2:3

Front

If 4 apples cost $2, how much do 10 apples cost?

Back

$5

Front

What is the scale factor if a model is 1 inch to 5 feet?

Back

1:60 (1 inch = 5 feet) or 1/60.