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Finding the Fourth Proportional to 138.82, 191.49 and 83.58

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Solution

The fourth proportional to 138.82, 191.49 and 83.58 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.82 : 191.49 = 83.58 : x
  2. Step 2: Convert to fraction form
    138.82/191.49 = 83.58/x
  3. Step 3: Cross multiply
    138.82x = 191.49 × 83.58
  4. Step 4: Simplify right side
    138.82x = 16,003.94
  5. Step 5: Solve for x
    x = 16,003.94/138.82
  6. Step 6: Final answer
    x = 115.28

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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.