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Finding the Fourth Proportional to 129,591.35, 178,837.86 and 72,229.08

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Solution

The fourth proportional to 129,591.35, 178,837.86 and 72,229.08 is: 99,677.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,591.35 : 178,837.86 = 72,229.08 : x
  2. Step 2: Convert to fraction form
    129,591.35/178,837.86 = 72,229.08/x
  3. Step 3: Cross multiply
    129,591.35x = 178,837.86 × 72,229.08
  4. Step 4: Simplify right side
    129,591.35x = 12,917,294,096.97
  5. Step 5: Solve for x
    x = 12,917,294,096.97/129,591.35
  6. Step 6: Final answer
    x = 99,677.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.