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Finding the Fourth Proportional to 87.04, 129.92 and 72.32

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Solution

The fourth proportional to 87.04, 129.92 and 72.32 is: 107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.04 : 129.92 = 72.32 : x
  2. Step 2: Convert to fraction form
    87.04/129.92 = 72.32/x
  3. Step 3: Cross multiply
    87.04x = 129.92 × 72.32
  4. Step 4: Simplify right side
    87.04x = 9,395.81
  5. Step 5: Solve for x
    x = 9,395.81/87.04
  6. Step 6: Final answer
    x = 107.95

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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.