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Finding the Fourth Proportional to 138.40, 191.03 and 85.97

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Solution

The fourth proportional to 138.40, 191.03 and 85.97 is: 118.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.40 : 191.03 = 85.97 : x
  2. Step 2: Convert to fraction form
    138.40/191.03 = 85.97/x
  3. Step 3: Cross multiply
    138.40x = 191.03 × 85.97
  4. Step 4: Simplify right side
    138.40x = 16,422.90
  5. Step 5: Solve for x
    x = 16,422.90/138.40
  6. Step 6: Final answer
    x = 118.66

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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.