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Finding the Fourth Proportional to 425,983.20, 639,493.20 and 215,512.80

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Solution

The fourth proportional to 425,983.20, 639,493.20 and 215,512.80 is: 323,531.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,983.20 : 639,493.20 = 215,512.80 : x
  2. Step 2: Convert to fraction form
    425,983.20/639,493.20 = 215,512.80/x
  3. Step 3: Cross multiply
    425,983.20x = 639,493.20 × 215,512.80
  4. Step 4: Simplify right side
    425,983.20x = 137,818,970,112.96
  5. Step 5: Solve for x
    x = 137,818,970,112.96/425,983.20
  6. Step 6: Final answer
    x = 323,531.47

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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.