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Finding the Fourth Proportional to 87.59, 131.01 and 81.11

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Solution

The fourth proportional to 87.59, 131.01 and 81.11 is: 121.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.59 : 131.01 = 81.11 : x
  2. Step 2: Convert to fraction form
    87.59/131.01 = 81.11/x
  3. Step 3: Cross multiply
    87.59x = 131.01 × 81.11
  4. Step 4: Simplify right side
    87.59x = 10,626.22
  5. Step 5: Solve for x
    x = 10,626.22/87.59
  6. Step 6: Final answer
    x = 121.32

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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.