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Finding the Third Proportional to 81.28 and 115.78

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Solution

The third proportional to 81.28 and 115.78 is: 164.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.28 : 115.78 = 115.78 : x
  2. Step 2: Convert to fraction form
    81.28/115.78 = 115.78/x
  3. Step 3: Cross multiply
    81.28x = 115.78 × 115.78
  4. Step 4: Simplify right side
    81.28x = 13,405.30
  5. Step 5: Solve for x
    x = 13,405.30/81.28
  6. Step 6: Final answer
    x = 164.92

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.