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Finding the Fourth Proportional to 87.44, 129.66 and 86.22

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Solution

The fourth proportional to 87.44, 129.66 and 86.22 is: 127.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.44 : 129.66 = 86.22 : x
  2. Step 2: Convert to fraction form
    87.44/129.66 = 86.22/x
  3. Step 3: Cross multiply
    87.44x = 129.66 × 86.22
  4. Step 4: Simplify right side
    87.44x = 11,179.29
  5. Step 5: Solve for x
    x = 11,179.29/87.44
  6. Step 6: Final answer
    x = 127.86

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.