Proportions

Front

What is a proportion?

Back

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

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the known values and then solve for the unknown.

Front

If the ratio of height to width is 5:19 and the height is 2.5 inches, what is the width?

Back

9.5 inches.

Front

What is the formula to find the width if the height and ratio are known?

Back

Width = (Height * Ratio Width) / Ratio Height.

Front

What does it mean if two ratios are equivalent?

Back

It means they represent the same relationship between quantities.

Front

If a quarterback completes 7 passes out of 8 attempts, what is his completion rate?

Back

87.5%.

Front

How do you find the total attempts if you know the completion rate and completed passes?

Back

Total Attempts = Completed Passes / Completion Rate.

Front

If a car travels 280 miles in 7 hours, what is its speed?

Back

Speed = Distance / Time = 40 miles per hour.

Front

How do you calculate distance traveled if speed and time are known?

Back

Distance = Speed * Time.

Front

If a baseball player has a hit rate of 4 out of 7, how many hits would he have after 42 at-bats?

Back

24 hits.