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Finding the Fourth Proportional to 129,760.60, 194,640.90 and 115,245.40

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Solution

The fourth proportional to 129,760.60, 194,640.90 and 115,245.40 is: 172,868.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,760.60 : 194,640.90 = 115,245.40 : x
  2. Step 2: Convert to fraction form
    129,760.60/194,640.90 = 115,245.40/x
  3. Step 3: Cross multiply
    129,760.60x = 194,640.90 × 115,245.40
  4. Step 4: Simplify right side
    129,760.60x = 22,431,468,376.86
  5. Step 5: Solve for x
    x = 22,431,468,376.86/129,760.60
  6. Step 6: Final answer
    x = 172,868.10

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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.