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Finding the Fourth Proportional to 80,569.60, 120,708.60 and 68,905.60

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Solution

The fourth proportional to 80,569.60, 120,708.60 and 68,905.60 is: 103,233.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,569.60 : 120,708.60 = 68,905.60 : x
  2. Step 2: Convert to fraction form
    80,569.60/120,708.60 = 68,905.60/x
  3. Step 3: Cross multiply
    80,569.60x = 120,708.60 × 68,905.60
  4. Step 4: Simplify right side
    80,569.60x = 8,317,498,508.16
  5. Step 5: Solve for x
    x = 8,317,498,508.16/80,569.60
  6. Step 6: Final answer
    x = 103,233.71

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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.