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Finding the Third Proportional to 11.81 and 18.28

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Solution

The third proportional to 11.81 and 18.28 is: 28.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.81 : 18.28 = 18.28 : x
  2. Step 2: Convert to fraction form
    11.81/18.28 = 18.28/x
  3. Step 3: Cross multiply
    11.81x = 18.28 × 18.28
  4. Step 4: Simplify right side
    11.81x = 334.20
  5. Step 5: Solve for x
    x = 334.20/11.81
  6. Step 6: Final answer
    x = 28.29

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.