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Finding the Fourth Proportional to 87.49, 129.44 and 87.22

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Solution

The fourth proportional to 87.49, 129.44 and 87.22 is: 129.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.49 : 129.44 = 87.22 : x
  2. Step 2: Convert to fraction form
    87.49/129.44 = 87.22/x
  3. Step 3: Cross multiply
    87.49x = 129.44 × 87.22
  4. Step 4: Simplify right side
    87.49x = 11,289.11
  5. Step 5: Solve for x
    x = 11,289.11/87.49
  6. Step 6: Final answer
    x = 129.04

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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.