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Finding the Third Proportional to 1,115 and 1,241

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Solution

The third proportional to 1,115 and 1,241 is: 1,381.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115 : 1,241 = 1,241 : x
  2. Step 2: Convert to fraction form
    1,115/1,241 = 1,241/x
  3. Step 3: Cross multiply
    1,115x = 1,241 × 1,241
  4. Step 4: Simplify right side
    1,115x = 1,540,081
  5. Step 5: Solve for x
    x = 1,540,081/1,115
  6. Step 6: Final answer
    x = 1,381.24

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.