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Finding the Fourth Proportional to 425,363.20, 638,045.76 and 399,381.76

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Solution

The fourth proportional to 425,363.20, 638,045.76 and 399,381.76 is: 599,073.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,363.20 : 638,045.76 = 399,381.76 : x
  2. Step 2: Convert to fraction form
    425,363.20/638,045.76 = 399,381.76/x
  3. Step 3: Cross multiply
    425,363.20x = 638,045.76 × 399,381.76
  4. Step 4: Simplify right side
    425,363.20x = 254,823,838,589.34
  5. Step 5: Solve for x
    x = 254,823,838,589.34/425,363.20
  6. Step 6: Final answer
    x = 599,073.54

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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.