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Finding the Third Proportional to 285.38 and 397.69

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Solution

The third proportional to 285.38 and 397.69 is: 554.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.38 : 397.69 = 397.69 : x
  2. Step 2: Convert to fraction form
    285.38/397.69 = 397.69/x
  3. Step 3: Cross multiply
    285.38x = 397.69 × 397.69
  4. Step 4: Simplify right side
    285.38x = 158,155.35
  5. Step 5: Solve for x
    x = 158,155.35/285.38
  6. Step 6: Final answer
    x = 554.20

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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.