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Finding the Third Proportional to 11.49 and 20.39

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Solution

The third proportional to 11.49 and 20.39 is: 36.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.49 : 20.39 = 20.39 : x
  2. Step 2: Convert to fraction form
    11.49/20.39 = 20.39/x
  3. Step 3: Cross multiply
    11.49x = 20.39 × 20.39
  4. Step 4: Simplify right side
    11.49x = 415.75
  5. Step 5: Solve for x
    x = 415.75/11.49
  6. Step 6: Final answer
    x = 36.18

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.