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Finding the Fourth Proportional to 100,708.38, 138,974.45 and 55,380.11

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Solution

The fourth proportional to 100,708.38, 138,974.45 and 55,380.11 is: 76,422.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,708.38 : 138,974.45 = 55,380.11 : x
  2. Step 2: Convert to fraction form
    100,708.38/138,974.45 = 55,380.11/x
  3. Step 3: Cross multiply
    100,708.38x = 138,974.45 × 55,380.11
  4. Step 4: Simplify right side
    100,708.38x = 7,696,419,356.42
  5. Step 5: Solve for x
    x = 7,696,419,356.42/100,708.38
  6. Step 6: Final answer
    x = 76,422.83

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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.