solve proportions - complex

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 3 pounds of hamburger meat costs $6, how much does 1 pound cost?

Back

$2 per pound.

Front

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

Back

40 miles per hour.

Front

What is the formula for direct variation?

Back

y = kx, where k is the constant of variation.

Front

If a car travels 40 miles per hour, how far will it travel in 3 hours?

Back

120 miles.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the constant value (k) that relates two variables in a proportional relationship.

Front

If 4/5 = x/20, what is x?

Back

16.

Front

What is the relationship between distance, rate, and time?

Back

Distance = Rate × Time.

Front

If 5/8 = 15/x, what is x?

Back

24.