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Finding the Third Proportional to 3.69 and 8.81

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Solution

The third proportional to 3.69 and 8.81 is: 21.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.69 : 8.81 = 8.81 : x
  2. Step 2: Convert to fraction form
    3.69/8.81 = 8.81/x
  3. Step 3: Cross multiply
    3.69x = 8.81 × 8.81
  4. Step 4: Simplify right side
    3.69x = 77.66
  5. Step 5: Solve for x
    x = 77.66/3.69
  6. Step 6: Final answer
    x = 21.06

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.