Representing Proportional Relationships

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other quantity is constant.

To find the constant of proportionality, divide one quantity by the other quantity in a proportional relationship.

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

It means that as one quantity increases or decreases, the other quantity increases or decreases at a constant rate.

Proportional relationships can be represented on a graph as a straight line that passes through the origin (0,0).

The unit rate is the ratio of two measurements in which the second quantity is one unit.

The unit rate is 60 miles per hour.

Set up a proportion and cross-multiply to find the missing value.

Distance = Speed × Time.

He will run 1350 feet.