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Finding the Fourth Proportional to 87.22, 130.18 and 76.97

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Solution

The fourth proportional to 87.22, 130.18 and 76.97 is: 114.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.22 : 130.18 = 76.97 : x
  2. Step 2: Convert to fraction form
    87.22/130.18 = 76.97/x
  3. Step 3: Cross multiply
    87.22x = 130.18 × 76.97
  4. Step 4: Simplify right side
    87.22x = 10,019.95
  5. Step 5: Solve for x
    x = 10,019.95/87.22
  6. Step 6: Final answer
    x = 114.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.