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Finding the Third Proportional to 138.28 and 193.88

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Solution

The third proportional to 138.28 and 193.88 is: 271.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.28 : 193.88 = 193.88 : x
  2. Step 2: Convert to fraction form
    138.28/193.88 = 193.88/x
  3. Step 3: Cross multiply
    138.28x = 193.88 × 193.88
  4. Step 4: Simplify right side
    138.28x = 37,587.52
  5. Step 5: Solve for x
    x = 37,587.52/138.28
  6. Step 6: Final answer
    x = 271.82

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.