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Finding the Third Proportional to 81 and 84.38

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Solution

The third proportional to 81 and 84.38 is: 87.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 84.38 = 84.38 : x
  2. Step 2: Convert to fraction form
    81/84.38 = 84.38/x
  3. Step 3: Cross multiply
    81x = 84.38 × 84.38
  4. Step 4: Simplify right side
    81x = 7,119.14
  5. Step 5: Solve for x
    x = 7,119.14/81
  6. Step 6: Final answer
    x = 87.89

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Why These Related Problems?

These problems maintain the same ratio (1.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.