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Finding the Fourth Proportional to 138,862.32, 191,680.32 and 91,131.12

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Solution

The fourth proportional to 138,862.32, 191,680.32 and 91,131.12 is: 125,793.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,862.32 : 191,680.32 = 91,131.12 : x
  2. Step 2: Convert to fraction form
    138,862.32/191,680.32 = 91,131.12/x
  3. Step 3: Cross multiply
    138,862.32x = 191,680.32 × 91,131.12
  4. Step 4: Simplify right side
    138,862.32x = 17,468,042,243.56
  5. Step 5: Solve for x
    x = 17,468,042,243.56/138,862.32
  6. Step 6: Final answer
    x = 125,793.97

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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.