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Expert-verified Found in: Page 351 ### Pre-algebra

Book edition Common Core Edition
Author(s) Ron Larson, Laurie Boswell, Timothy D. Kanold, Lee Stiff
Pages 183 pages
ISBN 9780547587776 # Use a proportion to answer the question. What percent of 90 is 40?

The number 40 is $44\frac{4}{9}%$ of 90.

See the step by step solution

## Step 1. Given Information.

The number is 90.

## Step 2. Calculation.

Let $x$ be the percentage.

Write percentage as a fraction.

Therefore,

$\frac{40}{90}=\frac{x}{100}$

Multiply both sides of the equation with 100 to isolate the variable on one side of the equation.

$\begin{array}{c}\frac{40}{90}×100=\frac{x}{100}×100\\ x=\frac{400}{9}\\ =44\frac{4}{9}\end{array}$

## Step 3. Conclusion.

The number 40 is $44\frac{4}{9}%$ of 90. ### Want to see more solutions like these? 