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Finding the Fourth Proportional to 100,680.70, 138,939.89 and 55,361.61

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Solution

The fourth proportional to 100,680.70, 138,939.89 and 55,361.61 is: 76,399.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,680.70 : 138,939.89 = 55,361.61 : x
  2. Step 2: Convert to fraction form
    100,680.70/138,939.89 = 55,361.61/x
  3. Step 3: Cross multiply
    100,680.70x = 138,939.89 × 55,361.61
  4. Step 4: Simplify right side
    100,680.70x = 7,691,936,003.62
  5. Step 5: Solve for x
    x = 7,691,936,003.62/100,680.70
  6. Step 6: Final answer
    x = 76,399.31

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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.