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What is the first step in solving for an unknown value in a proportion?

Question

What is the first step in solving for an unknown value in a proportion?

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Solution

The first step in solving for an unknown value in a proportion is to set up the proportion as an equation. This involves writing the two ratios as fractions and setting them equal to each other. For example, if you have the proportion ab=cd\frac{a}{b} = \frac{c}{d}, you would write it as an equation: ad=bca \cdot d = b \cdot c.

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Solving Proportions

When using a proportion to solve a real-life application, one must know of the four values in the proportion.

Solve the proportion. Enter any solution as an integer or reduced fraction. Separate with commas if there is more than one solution. If there are no solutions, click the No Solution button.

Find the missing term in the proportion:

Ratio and Proportion

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