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Finding the Fourth Proportional to 425,807.20, 639,229.20 and 215,336.80

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Solution

The fourth proportional to 425,807.20, 639,229.20 and 215,336.80 is: 323,267.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,807.20 : 639,229.20 = 215,336.80 : x
  2. Step 2: Convert to fraction form
    425,807.20/639,229.20 = 215,336.80/x
  3. Step 3: Cross multiply
    425,807.20x = 639,229.20 × 215,336.80
  4. Step 4: Simplify right side
    425,807.20x = 137,649,570,394.56
  5. Step 5: Solve for x
    x = 137,649,570,394.56/425,807.20
  6. Step 6: Final answer
    x = 323,267.36

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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.