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Finding the Fourth Proportional to 87.71, 131.36 and 72.52

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Solution

The fourth proportional to 87.71, 131.36 and 72.52 is: 108.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.71 : 131.36 = 72.52 : x
  2. Step 2: Convert to fraction form
    87.71/131.36 = 72.52/x
  3. Step 3: Cross multiply
    87.71x = 131.36 × 72.52
  4. Step 4: Simplify right side
    87.71x = 9,525.54
  5. Step 5: Solve for x
    x = 9,525.54/87.71
  6. Step 6: Final answer
    x = 108.61

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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.