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Finding the Third Proportional to 109.13 and 161.81

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Solution

The third proportional to 109.13 and 161.81 is: 239.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.13 : 161.81 = 161.81 : x
  2. Step 2: Convert to fraction form
    109.13/161.81 = 161.81/x
  3. Step 3: Cross multiply
    109.13x = 161.81 × 161.81
  4. Step 4: Simplify right side
    109.13x = 26,183.29
  5. Step 5: Solve for x
    x = 26,183.29/109.13
  6. Step 6: Final answer
    x = 239.94

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.