**Definition of Proportion**

- A proportion is an equation written in the form stating that two ratios are equivalent.
- In other words, two sets of numbers are proportional if one set is a constant times the other.

**Examples of Proportion**

- , are examples of proportions.

**Solved Example on Proportion**

A cardboard model of a Honda bike is part of an outdoor display. Its height is 4 ft. The actual Honda bike is 5 ft long and 2 ft high. Find the length of the model, if its dimensions are proportionate to the real bike.

Choices:

A. 11 ft

B. 12 ft

C. 9 ft

D. 10 ft

Correct Answer: D

Solution:

Step 1:Let n be the length of Honda bike cardboard model.

Step 2:[Write a proportion.]

Step 3:n × 2 = 4 × 5 [Write the cross products.]

Step 4:n = 10 [Simplify the expression.]

Step 5:The length of the Honda bike cardboard model is 10 ft.

**Related Terms for Proportion **

- Ratio
- Equation
- Proportion