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Finding the Fourth Proportional to 80,704.20, 120,912.30 and 39,059.40

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Solution

The fourth proportional to 80,704.20, 120,912.30 and 39,059.40 is: 58,519.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,704.20 : 120,912.30 = 39,059.40 : x
  2. Step 2: Convert to fraction form
    80,704.20/120,912.30 = 39,059.40/x
  3. Step 3: Cross multiply
    80,704.20x = 120,912.30 × 39,059.40
  4. Step 4: Simplify right side
    80,704.20x = 4,722,761,890.62
  5. Step 5: Solve for x
    x = 4,722,761,890.62/80,704.20
  6. Step 6: Final answer
    x = 58,519.41

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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.