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Finding the Fourth Proportional to 129,591.92, 178,815.20 and 72,218.68

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Solution

The fourth proportional to 129,591.92, 178,815.20 and 72,218.68 is: 99,649.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,591.92 : 178,815.20 = 72,218.68 : x
  2. Step 2: Convert to fraction form
    129,591.92/178,815.20 = 72,218.68/x
  3. Step 3: Cross multiply
    129,591.92x = 178,815.20 × 72,218.68
  4. Step 4: Simplify right side
    129,591.92x = 12,913,796,899.80
  5. Step 5: Solve for x
    x = 12,913,796,899.80/129,591.92
  6. Step 6: Final answer
    x = 99,649.71

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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.