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Finding the Fourth Proportional to 129.11, 193.76 and 88.61

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Solution

The fourth proportional to 129.11, 193.76 and 88.61 is: 132.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.11 : 193.76 = 88.61 : x
  2. Step 2: Convert to fraction form
    129.11/193.76 = 88.61/x
  3. Step 3: Cross multiply
    129.11x = 193.76 × 88.61
  4. Step 4: Simplify right side
    129.11x = 17,167.66
  5. Step 5: Solve for x
    x = 17,167.66/129.11
  6. Step 6: Final answer
    x = 132.97

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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.