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Finding the Fourth Proportional to 381,535.32, 572,155.44 and 128,747.88

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Solution

The fourth proportional to 381,535.32, 572,155.44 and 128,747.88 is: 193,072.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,535.32 : 572,155.44 = 128,747.88 : x
  2. Step 2: Convert to fraction form
    381,535.32/572,155.44 = 128,747.88/x
  3. Step 3: Cross multiply
    381,535.32x = 572,155.44 × 128,747.88
  4. Step 4: Simplify right side
    381,535.32x = 73,663,799,930.47
  5. Step 5: Solve for x
    x = 73,663,799,930.47/381,535.32
  6. Step 6: Final answer
    x = 193,072.03

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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.