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Finding the Fourth Proportional to 138,452.62, 191,128.40 and 81,083.97

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Solution

The fourth proportional to 138,452.62, 191,128.40 and 81,083.97 is: 111,933.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,452.62 : 191,128.40 = 81,083.97 : x
  2. Step 2: Convert to fraction form
    138,452.62/191,128.40 = 81,083.97/x
  3. Step 3: Cross multiply
    138,452.62x = 191,128.40 × 81,083.97
  4. Step 4: Simplify right side
    138,452.62x = 15,497,449,451.75
  5. Step 5: Solve for x
    x = 15,497,449,451.75/138,452.62
  6. Step 6: Final answer
    x = 111,933.23

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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.