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Finding the Fourth Proportional to 138,891.70, 191,669.61 and 78,481.90

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Solution

The fourth proportional to 138,891.70, 191,669.61 and 78,481.90 is: 108,304.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,891.70 : 191,669.61 = 78,481.90 : x
  2. Step 2: Convert to fraction form
    138,891.70/191,669.61 = 78,481.90/x
  3. Step 3: Cross multiply
    138,891.70x = 191,669.61 × 78,481.90
  4. Step 4: Simplify right side
    138,891.70x = 15,042,595,165.06
  5. Step 5: Solve for x
    x = 15,042,595,165.06/138,891.70
  6. Step 6: Final answer
    x = 108,304.49

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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.