Direct Proportion Definition

Definition: Direct proportion is the relationship between two variables when their ratio is equal to a constant value. Examples: The volume of an ideal gas is directly proportional to the absolute temperature of the gas (Charles Law)If you get paid by the hour, the more you work the more you will get paid. If you earn $15/hour and work 2 hours, you will earn $30 (Not including taxes, etc.) and if you work 4 hours, you will earn $60. The ratio of money earned to hours worked is 15 to 1 or $15/hour.