Rule of Three - Direct Proportion
WHAT IS IT ?
The Rule of Three is a simple mathematical method for calculating direct or inverse proportionality of a quantity depending on another quantity according to the formula, where is a constant. Simply put, quantities are in direct proportion. Their ratio is equal to a constant. If the quantity doubles or triples, the other quantity will also double or triple as a result.
CALCULATION:
EXAMPLE:
A car consumes 6 liters of petrol per 100 kilometers. How many liters of petrol will it consume over 250 kilometers?
100 km ........ 6 liters
↑250 km ........ x liters
Thus
6 * (250 / 100) = x
6 * 2.5 = x
15 = x
The car will consume 15 liters of petrol over 250 km.
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