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Finding the Third Proportional to 11.91 and 21.89

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Solution

The third proportional to 11.91 and 21.89 is: 40.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.91 : 21.89 = 21.89 : x
  2. Step 2: Convert to fraction form
    11.91/21.89 = 21.89/x
  3. Step 3: Cross multiply
    11.91x = 21.89 × 21.89
  4. Step 4: Simplify right side
    11.91x = 479.20
  5. Step 5: Solve for x
    x = 479.20/11.91
  6. Step 6: Final answer
    x = 40.25

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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.