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Finding the Fourth Proportional to 84,635.76, 125,845.92 and 81,092.64

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Solution

The fourth proportional to 84,635.76, 125,845.92 and 81,092.64 is: 120,577.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,635.76 : 125,845.92 = 81,092.64 : x
  2. Step 2: Convert to fraction form
    84,635.76/125,845.92 = 81,092.64/x
  3. Step 3: Cross multiply
    84,635.76x = 125,845.92 × 81,092.64
  4. Step 4: Simplify right side
    84,635.76x = 10,205,177,886.03
  5. Step 5: Solve for x
    x = 10,205,177,886.03/84,635.76
  6. Step 6: Final answer
    x = 120,577.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.