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Finding the Fourth Proportional to 71,939.68, 99,275.76 and 40,108

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Solution

The fourth proportional to 71,939.68, 99,275.76 and 40,108 is: 55,348.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,939.68 : 99,275.76 = 40,108 : x
  2. Step 2: Convert to fraction form
    71,939.68/99,275.76 = 40,108/x
  3. Step 3: Cross multiply
    71,939.68x = 99,275.76 × 40,108
  4. Step 4: Simplify right side
    71,939.68x = 3,981,752,182.08
  5. Step 5: Solve for x
    x = 3,981,752,182.08/71,939.68
  6. Step 6: Final answer
    x = 55,348.48

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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.