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Finding the Fourth Proportional to 87,687.92, 120,980.76 and 53,660.90

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Solution

The fourth proportional to 87,687.92, 120,980.76 and 53,660.90 is: 74,034.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,687.92 : 120,980.76 = 53,660.90 : x
  2. Step 2: Convert to fraction form
    87,687.92/120,980.76 = 53,660.90/x
  3. Step 3: Cross multiply
    87,687.92x = 120,980.76 × 53,660.90
  4. Step 4: Simplify right side
    87,687.92x = 6,491,936,464.28
  5. Step 5: Solve for x
    x = 6,491,936,464.28/87,687.92
  6. Step 6: Final answer
    x = 74,034.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.