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Finding the Third Proportional to 81.38 and 135

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Solution

The third proportional to 81.38 and 135 is: 223.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.38 : 135 = 135 : x
  2. Step 2: Convert to fraction form
    81.38/135 = 135/x
  3. Step 3: Cross multiply
    81.38x = 135 × 135
  4. Step 4: Simplify right side
    81.38x = 18,225
  5. Step 5: Solve for x
    x = 18,225/81.38
  6. Step 6: Final answer
    x = 223.96

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.