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Finding the Fourth Proportional to 425,737.64, 638,013.36 and 215,129.72

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Solution

The fourth proportional to 425,737.64, 638,013.36 and 215,129.72 is: 322,394.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,737.64 : 638,013.36 = 215,129.72 : x
  2. Step 2: Convert to fraction form
    425,737.64/638,013.36 = 215,129.72/x
  3. Step 3: Cross multiply
    425,737.64x = 638,013.36 × 215,129.72
  4. Step 4: Simplify right side
    425,737.64x = 137,255,635,493.06
  5. Step 5: Solve for x
    x = 137,255,635,493.06/425,737.64
  6. Step 6: Final answer
    x = 322,394.88

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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.