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Finding the Fourth Proportional to 381,627.59, 572,507.34 and 128,909.91

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Solution

The fourth proportional to 381,627.59, 572,507.34 and 128,909.91 is: 193,387.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,627.59 : 572,507.34 = 128,909.91 : x
  2. Step 2: Convert to fraction form
    381,627.59/572,507.34 = 128,909.91/x
  3. Step 3: Cross multiply
    381,627.59x = 572,507.34 × 128,909.91
  4. Step 4: Simplify right side
    381,627.59x = 73,801,869,673.74
  5. Step 5: Solve for x
    x = 73,801,869,673.74/381,627.59
  6. Step 6: Final answer
    x = 193,387.15

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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.