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Finding the Third Proportional to 81.28 and 117.56

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Solution

The third proportional to 81.28 and 117.56 is: 170.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.28 : 117.56 = 117.56 : x
  2. Step 2: Convert to fraction form
    81.28/117.56 = 117.56/x
  3. Step 3: Cross multiply
    81.28x = 117.56 × 117.56
  4. Step 4: Simplify right side
    81.28x = 13,820.94
  5. Step 5: Solve for x
    x = 13,820.94/81.28
  6. Step 6: Final answer
    x = 170.04

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.