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Finding the Fourth Proportional to 381,853.05, 572,781.15 and 129,134.85

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Solution

The fourth proportional to 381,853.05, 572,781.15 and 129,134.85 is: 193,702.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,853.05 : 572,781.15 = 129,134.85 : x
  2. Step 2: Convert to fraction form
    381,853.05/572,781.15 = 129,134.85/x
  3. Step 3: Cross multiply
    381,853.05x = 572,781.15 × 129,134.85
  4. Step 4: Simplify right side
    381,853.05x = 73,966,007,888.08
  5. Step 5: Solve for x
    x = 73,966,007,888.08/381,853.05
  6. Step 6: Final answer
    x = 193,702.81

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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.