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Finding the Third Proportional to 11.29 and 20.72

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Solution

The third proportional to 11.29 and 20.72 is: 38.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.29 : 20.72 = 20.72 : x
  2. Step 2: Convert to fraction form
    11.29/20.72 = 20.72/x
  3. Step 3: Cross multiply
    11.29x = 20.72 × 20.72
  4. Step 4: Simplify right side
    11.29x = 429.51
  5. Step 5: Solve for x
    x = 429.51/11.29
  6. Step 6: Final answer
    x = 38.06

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.