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Finding the Fourth Proportional to 80,768.80, 120,865.20 and 51,200.80

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Solution

The fourth proportional to 80,768.80, 120,865.20 and 51,200.80 is: 76,618.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,768.80 : 120,865.20 = 51,200.80 : x
  2. Step 2: Convert to fraction form
    80,768.80/120,865.20 = 51,200.80/x
  3. Step 3: Cross multiply
    80,768.80x = 120,865.20 × 51,200.80
  4. Step 4: Simplify right side
    80,768.80x = 6,188,394,932.16
  5. Step 5: Solve for x
    x = 6,188,394,932.16/80,768.80
  6. Step 6: Final answer
    x = 76,618.63

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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.