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Finding the Fourth Proportional to 425,419.04, 638,105.52 and 129,908

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Solution

The fourth proportional to 425,419.04, 638,105.52 and 129,908 is: 194,854.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,419.04 : 638,105.52 = 129,908 : x
  2. Step 2: Convert to fraction form
    425,419.04/638,105.52 = 129,908/x
  3. Step 3: Cross multiply
    425,419.04x = 638,105.52 × 129,908
  4. Step 4: Simplify right side
    425,419.04x = 82,895,011,892.16
  5. Step 5: Solve for x
    x = 82,895,011,892.16/425,419.04
  6. Step 6: Final answer
    x = 194,854.96

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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.