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Finding the Third Proportional to 81.38 and 180

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Solution

The third proportional to 81.38 and 180 is: 398.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.38 : 180 = 180 : x
  2. Step 2: Convert to fraction form
    81.38/180 = 180/x
  3. Step 3: Cross multiply
    81.38x = 180 × 180
  4. Step 4: Simplify right side
    81.38x = 32,400
  5. Step 5: Solve for x
    x = 32,400/81.38
  6. Step 6: Final answer
    x = 398.16

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.