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Finding the Fourth Proportional to 425,665.53, 638,500.56 and 126,148.70

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Solution

The fourth proportional to 425,665.53, 638,500.56 and 126,148.70 is: 189,223.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,665.53 : 638,500.56 = 126,148.70 : x
  2. Step 2: Convert to fraction form
    425,665.53/638,500.56 = 126,148.70/x
  3. Step 3: Cross multiply
    425,665.53x = 638,500.56 × 126,148.70
  4. Step 4: Simplify right side
    425,665.53x = 80,546,015,593.27
  5. Step 5: Solve for x
    x = 80,546,015,593.27/425,665.53
  6. Step 6: Final answer
    x = 189,223.72

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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.