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Finding the Fourth Proportional to 139,540.90, 209,311.35 and 83,553.70

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Solution

The fourth proportional to 139,540.90, 209,311.35 and 83,553.70 is: 125,330.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,540.90 : 209,311.35 = 83,553.70 : x
  2. Step 2: Convert to fraction form
    139,540.90/209,311.35 = 83,553.70/x
  3. Step 3: Cross multiply
    139,540.90x = 209,311.35 × 83,553.70
  4. Step 4: Simplify right side
    139,540.90x = 17,488,737,744.50
  5. Step 5: Solve for x
    x = 17,488,737,744.50/139,540.90
  6. Step 6: Final answer
    x = 125,330.55

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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.