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Finding the Fourth Proportional to 87.63, 131.31 and 80.88

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Solution

The fourth proportional to 87.63, 131.31 and 80.88 is: 121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.63 : 131.31 = 80.88 : x
  2. Step 2: Convert to fraction form
    87.63/131.31 = 80.88/x
  3. Step 3: Cross multiply
    87.63x = 131.31 × 80.88
  4. Step 4: Simplify right side
    87.63x = 10,620.35
  5. Step 5: Solve for x
    x = 10,620.35/87.63
  6. Step 6: Final answer
    x = 121.20

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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.