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Finding the Fourth Proportional to 425,992.28, 638,879 and 126,402

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Solution

The fourth proportional to 425,992.28, 638,879 and 126,402 is: 189,570.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,992.28 : 638,879 = 126,402 : x
  2. Step 2: Convert to fraction form
    425,992.28/638,879 = 126,402/x
  3. Step 3: Cross multiply
    425,992.28x = 638,879 × 126,402
  4. Step 4: Simplify right side
    425,992.28x = 80,755,583,358
  5. Step 5: Solve for x
    x = 80,755,583,358/425,992.28
  6. Step 6: Final answer
    x = 189,570.53

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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.