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Finding the Fourth Proportional to 139,793.90, 209,540.03 and 68,633.78

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Solution

The fourth proportional to 139,793.90, 209,540.03 and 68,633.78 is: 102,876.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,793.90 : 209,540.03 = 68,633.78 : x
  2. Step 2: Convert to fraction form
    139,793.90/209,540.03 = 68,633.78/x
  3. Step 3: Cross multiply
    139,793.90x = 209,540.03 × 68,633.78
  4. Step 4: Simplify right side
    139,793.90x = 14,381,522,929.34
  5. Step 5: Solve for x
    x = 14,381,522,929.34/139,793.90
  6. Step 6: Final answer
    x = 102,876.62

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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.