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Finding the Fourth Proportional to 80,791.29, 121,242.29 and 28,200.78

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Solution

The fourth proportional to 80,791.29, 121,242.29 and 28,200.78 is: 42,320.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,791.29 : 121,242.29 = 28,200.78 : x
  2. Step 2: Convert to fraction form
    80,791.29/121,242.29 = 28,200.78/x
  3. Step 3: Cross multiply
    80,791.29x = 121,242.29 × 28,200.78
  4. Step 4: Simplify right side
    80,791.29x = 3,419,127,005.98
  5. Step 5: Solve for x
    x = 3,419,127,005.98/80,791.29
  6. Step 6: Final answer
    x = 42,320.49

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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.