The Math Meridian
Back to Grade 6

Solve proportions

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Learn it A proportion says two ratios are equal. Find the scale factor between matching parts, or cross-multiply.

Example: $\frac{6}{15} = \frac{x}{40}$

  1. Cross-multiply: $15x = 6 \times 40 = 240$.
  2. $x = 240 \div 15 = 16$.
  3. Check: $\frac{16}{40} = \frac{2}{5} = \frac{6}{15}$ ✓.

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