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Finding the Fourth Proportional to 138,763.68, 191,576.39 and 91,100.58

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Solution

The fourth proportional to 138,763.68, 191,576.39 and 91,100.58 is: 125,772.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,763.68 : 191,576.39 = 91,100.58 : x
  2. Step 2: Convert to fraction form
    138,763.68/191,576.39 = 91,100.58/x
  3. Step 3: Cross multiply
    138,763.68x = 191,576.39 × 91,100.58
  4. Step 4: Simplify right side
    138,763.68x = 17,452,719,787.80
  5. Step 5: Solve for x
    x = 17,452,719,787.80/138,763.68
  6. Step 6: Final answer
    x = 125,772.97

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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.