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Finding the Fourth Proportional to 87.08, 131.27 and 80.12

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Solution

The fourth proportional to 87.08, 131.27 and 80.12 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.08 : 131.27 = 80.12 : x
  2. Step 2: Convert to fraction form
    87.08/131.27 = 80.12/x
  3. Step 3: Cross multiply
    87.08x = 131.27 × 80.12
  4. Step 4: Simplify right side
    87.08x = 10,517.35
  5. Step 5: Solve for x
    x = 10,517.35/87.08
  6. Step 6: Final answer
    x = 120.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.