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Finding the Fourth Proportional to 78,350.60, 108,123.17 and 42,539.90

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Solution

The fourth proportional to 78,350.60, 108,123.17 and 42,539.90 is: 58,704.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,350.60 : 108,123.17 = 42,539.90 : x
  2. Step 2: Convert to fraction form
    78,350.60/108,123.17 = 42,539.90/x
  3. Step 3: Cross multiply
    78,350.60x = 108,123.17 × 42,539.90
  4. Step 4: Simplify right side
    78,350.60x = 4,599,548,839.48
  5. Step 5: Solve for x
    x = 4,599,548,839.48/78,350.60
  6. Step 6: Final answer
    x = 58,704.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.