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Finding the Fourth Proportional to 87.38, 131.07 and 51.28

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Solution

The fourth proportional to 87.38, 131.07 and 51.28 is: 76.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.38 : 131.07 = 51.28 : x
  2. Step 2: Convert to fraction form
    87.38/131.07 = 51.28/x
  3. Step 3: Cross multiply
    87.38x = 131.07 × 51.28
  4. Step 4: Simplify right side
    87.38x = 6,721.27
  5. Step 5: Solve for x
    x = 6,721.27/87.38
  6. Step 6: Final answer
    x = 76.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.