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Finding the Fourth Proportional to 129,694.67, 178,978.96 and 72,337.70

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Solution

The fourth proportional to 129,694.67, 178,978.96 and 72,337.70 is: 99,826.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,694.67 : 178,978.96 = 72,337.70 : x
  2. Step 2: Convert to fraction form
    129,694.67/178,978.96 = 72,337.70/x
  3. Step 3: Cross multiply
    129,694.67x = 178,978.96 × 72,337.70
  4. Step 4: Simplify right side
    129,694.67x = 12,946,926,314.79
  5. Step 5: Solve for x
    x = 12,946,926,314.79/129,694.67
  6. Step 6: Final answer
    x = 99,826.20

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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.