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Finding the Third Proportional to 11.81 and 28.05

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Solution

The third proportional to 11.81 and 28.05 is: 66.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.81 : 28.05 = 28.05 : x
  2. Step 2: Convert to fraction form
    11.81/28.05 = 28.05/x
  3. Step 3: Cross multiply
    11.81x = 28.05 × 28.05
  4. Step 4: Simplify right side
    11.81x = 787.07
  5. Step 5: Solve for x
    x = 787.07/11.81
  6. Step 6: Final answer
    x = 66.63

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.