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Finding the Fourth Proportional to 280,640.85, 420,910.66 and 80,912.17

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Solution

The fourth proportional to 280,640.85, 420,910.66 and 80,912.17 is: 121,353.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,640.85 : 420,910.66 = 80,912.17 : x
  2. Step 2: Convert to fraction form
    280,640.85/420,910.66 = 80,912.17/x
  3. Step 3: Cross multiply
    280,640.85x = 420,910.66 × 80,912.17
  4. Step 4: Simplify right side
    280,640.85x = 34,056,794,876.73
  5. Step 5: Solve for x
    x = 34,056,794,876.73/280,640.85
  6. Step 6: Final answer
    x = 121,353.66

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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.