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Finding the Fourth Proportional to 80,391.68, 120,570.12 and 50,769.92

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Solution

The fourth proportional to 80,391.68, 120,570.12 and 50,769.92 is: 76,143.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,391.68 : 120,570.12 = 50,769.92 : x
  2. Step 2: Convert to fraction form
    80,391.68/120,570.12 = 50,769.92/x
  3. Step 3: Cross multiply
    80,391.68x = 120,570.12 × 50,769.92
  4. Step 4: Simplify right side
    80,391.68x = 6,121,335,346.79
  5. Step 5: Solve for x
    x = 6,121,335,346.79/80,391.68
  6. Step 6: Final answer
    x = 76,143.89

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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.