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Finding the Third Proportional to 206.72 and 286.88

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Solution

The third proportional to 206.72 and 286.88 is: 398.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.72 : 286.88 = 286.88 : x
  2. Step 2: Convert to fraction form
    206.72/286.88 = 286.88/x
  3. Step 3: Cross multiply
    206.72x = 286.88 × 286.88
  4. Step 4: Simplify right side
    206.72x = 82,297.27
  5. Step 5: Solve for x
    x = 82,297.27/206.72
  6. Step 6: Final answer
    x = 398.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.