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Finding the Fourth Proportional to 425,572.40, 638,452.05 and 126,076.43

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Solution

The fourth proportional to 425,572.40, 638,452.05 and 126,076.43 is: 189,142.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,572.40 : 638,452.05 = 126,076.43 : x
  2. Step 2: Convert to fraction form
    425,572.40/638,452.05 = 126,076.43/x
  3. Step 3: Cross multiply
    425,572.40x = 638,452.05 × 126,076.43
  4. Step 4: Simplify right side
    425,572.40x = 80,493,754,559.80
  5. Step 5: Solve for x
    x = 80,493,754,559.80/425,572.40
  6. Step 6: Final answer
    x = 189,142.33

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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.