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Finding the Fourth Proportional to 138,572.26, 191,258.49 and 90,736.90

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Solution

The fourth proportional to 138,572.26, 191,258.49 and 90,736.90 is: 125,235.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,572.26 : 191,258.49 = 90,736.90 : x
  2. Step 2: Convert to fraction form
    138,572.26/191,258.49 = 90,736.90/x
  3. Step 3: Cross multiply
    138,572.26x = 191,258.49 × 90,736.90
  4. Step 4: Simplify right side
    138,572.26x = 17,354,202,481.28
  5. Step 5: Solve for x
    x = 17,354,202,481.28/138,572.26
  6. Step 6: Final answer
    x = 125,235.76

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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.