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Finding the Fourth Proportional to 425,431.08, 638,139.42 and 125,910

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Solution

The fourth proportional to 425,431.08, 638,139.42 and 125,910 is: 188,862.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,431.08 : 638,139.42 = 125,910 : x
  2. Step 2: Convert to fraction form
    425,431.08/638,139.42 = 125,910/x
  3. Step 3: Cross multiply
    425,431.08x = 638,139.42 × 125,910
  4. Step 4: Simplify right side
    425,431.08x = 80,348,134,372.20
  5. Step 5: Solve for x
    x = 80,348,134,372.20/425,431.08
  6. Step 6: Final answer
    x = 188,862.87

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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.