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Finding the Fourth Proportional to 80,604.60, 120,761.10 and 68,940.60

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Solution

The fourth proportional to 80,604.60, 120,761.10 and 68,940.60 is: 103,286.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,604.60 : 120,761.10 = 68,940.60 : x
  2. Step 2: Convert to fraction form
    80,604.60/120,761.10 = 68,940.60/x
  3. Step 3: Cross multiply
    80,604.60x = 120,761.10 × 68,940.60
  4. Step 4: Simplify right side
    80,604.60x = 8,325,342,690.66
  5. Step 5: Solve for x
    x = 8,325,342,690.66/80,604.60
  6. Step 6: Final answer
    x = 103,286.20

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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.