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Finding the Third Proportional to 81 and 121.71

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Solution

The third proportional to 81 and 121.71 is: 182.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 121.71 = 121.71 : x
  2. Step 2: Convert to fraction form
    81/121.71 = 121.71/x
  3. Step 3: Cross multiply
    81x = 121.71 × 121.71
  4. Step 4: Simplify right side
    81x = 14,813.55
  5. Step 5: Solve for x
    x = 14,813.55/81
  6. Step 6: Final answer
    x = 182.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.