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Finding the Fourth Proportional to 87.73, 131.73 and 86.11

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Solution

The fourth proportional to 87.73, 131.73 and 86.11 is: 129.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.73 : 131.73 = 86.11 : x
  2. Step 2: Convert to fraction form
    87.73/131.73 = 86.11/x
  3. Step 3: Cross multiply
    87.73x = 131.73 × 86.11
  4. Step 4: Simplify right side
    87.73x = 11,343.27
  5. Step 5: Solve for x
    x = 11,343.27/87.73
  6. Step 6: Final answer
    x = 129.30

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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.