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Finding the Fourth Proportional to 71,940, 99,278.44 and 40,105.38

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Solution

The fourth proportional to 71,940, 99,278.44 and 40,105.38 is: 55,346.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,940 : 99,278.44 = 40,105.38 : x
  2. Step 2: Convert to fraction form
    71,940/99,278.44 = 40,105.38/x
  3. Step 3: Cross multiply
    71,940x = 99,278.44 × 40,105.38
  4. Step 4: Simplify right side
    71,940x = 3,981,599,562.01
  5. Step 5: Solve for x
    x = 3,981,599,562.01/71,940
  6. Step 6: Final answer
    x = 55,346.12

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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.