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Finding the Third Proportional to 81 and 171.13

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Solution

The third proportional to 81 and 171.13 is: 361.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 171.13 = 171.13 : x
  2. Step 2: Convert to fraction form
    81/171.13 = 171.13/x
  3. Step 3: Cross multiply
    81x = 171.13 × 171.13
  4. Step 4: Simplify right side
    81x = 29,283.77
  5. Step 5: Solve for x
    x = 29,283.77/81
  6. Step 6: Final answer
    x = 361.53

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.