7.3  Proportion
We will learn to determine an unknown value using the unitary method.
  • Proportion is a comparison between two different quantities of units and is usually expressed as one quantity per unit of another quantity.
  • Proportion can be found by dividing the two quantities involved.
  • The unit of rate measurement is the unit of numerator per unit of the denominator.

A car can travel 350 km with 50 litres of petrol. How far would it be if the car was only filled with 20 litres of petrol?

50 litre = 350 km
20 litre = ____ km
\({\frac{350}{50}}\times20=140 \text{ km}\)