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Finding the Fourth Proportional to 426,487.86, 639,687.88 and 142,147.70

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Solution

The fourth proportional to 426,487.86, 639,687.88 and 142,147.70 is: 213,206.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,487.86 : 639,687.88 = 142,147.70 : x
  2. Step 2: Convert to fraction form
    426,487.86/639,687.88 = 142,147.70/x
  3. Step 3: Cross multiply
    426,487.86x = 639,687.88 × 142,147.70
  4. Step 4: Simplify right side
    426,487.86x = 90,930,160,859.88
  5. Step 5: Solve for x
    x = 90,930,160,859.88/426,487.86
  6. Step 6: Final answer
    x = 213,206.91

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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.