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Finding the Fourth Proportional to 87.39, 131.27 and 74.58

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Solution

The fourth proportional to 87.39, 131.27 and 74.58 is: 112.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.39 : 131.27 = 74.58 : x
  2. Step 2: Convert to fraction form
    87.39/131.27 = 74.58/x
  3. Step 3: Cross multiply
    87.39x = 131.27 × 74.58
  4. Step 4: Simplify right side
    87.39x = 9,789.74
  5. Step 5: Solve for x
    x = 9,789.74/87.39
  6. Step 6: Final answer
    x = 112.02

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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.