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Finding the Fourth Proportional to 81,549.68, 112,520.58 and 78,861.74

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Solution

The fourth proportional to 81,549.68, 112,520.58 and 78,861.74 is: 108,811.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,549.68 : 112,520.58 = 78,861.74 : x
  2. Step 2: Convert to fraction form
    81,549.68/112,520.58 = 78,861.74/x
  3. Step 3: Cross multiply
    81,549.68x = 112,520.58 × 78,861.74
  4. Step 4: Simplify right side
    81,549.68x = 8,873,568,724.61
  5. Step 5: Solve for x
    x = 8,873,568,724.61/81,549.68
  6. Step 6: Final answer
    x = 108,811.82

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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.