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Finding the Fourth Proportional to 129,751.91, 179,062.94 and 81,987.83

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Solution

The fourth proportional to 129,751.91, 179,062.94 and 81,987.83 is: 113,146.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,751.91 : 179,062.94 = 81,987.83 : x
  2. Step 2: Convert to fraction form
    129,751.91/179,062.94 = 81,987.83/x
  3. Step 3: Cross multiply
    129,751.91x = 179,062.94 × 81,987.83
  4. Step 4: Simplify right side
    129,751.91x = 14,680,981,193.68
  5. Step 5: Solve for x
    x = 14,680,981,193.68/129,751.91
  6. Step 6: Final answer
    x = 113,146.56

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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.