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Finding the Fourth Proportional to 138.97, 191.87 and 107.92

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Solution

The fourth proportional to 138.97, 191.87 and 107.92 is: 149.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.97 : 191.87 = 107.92 : x
  2. Step 2: Convert to fraction form
    138.97/191.87 = 107.92/x
  3. Step 3: Cross multiply
    138.97x = 191.87 × 107.92
  4. Step 4: Simplify right side
    138.97x = 20,706.61
  5. Step 5: Solve for x
    x = 20,706.61/138.97
  6. Step 6: Final answer
    x = 149.00

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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.