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Finding the Fourth Proportional to 426,487.76, 639,517.71 and 142,078.32

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Solution

The fourth proportional to 426,487.76, 639,517.71 and 142,078.32 is: 213,046.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,487.76 : 639,517.71 = 142,078.32 : x
  2. Step 2: Convert to fraction form
    426,487.76/639,517.71 = 142,078.32/x
  3. Step 3: Cross multiply
    426,487.76x = 639,517.71 × 142,078.32
  4. Step 4: Simplify right side
    426,487.76x = 90,861,601,847.05
  5. Step 5: Solve for x
    x = 90,861,601,847.05/426,487.76
  6. Step 6: Final answer
    x = 213,046.21

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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.