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Finding the Third Proportional to 3,891 and 7,161

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Solution

The third proportional to 3,891 and 7,161 is: 13,179.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891 : 7,161 = 7,161 : x
  2. Step 2: Convert to fraction form
    3,891/7,161 = 7,161/x
  3. Step 3: Cross multiply
    3,891x = 7,161 × 7,161
  4. Step 4: Simplify right side
    3,891x = 51,279,921
  5. Step 5: Solve for x
    x = 51,279,921/3,891
  6. Step 6: Final answer
    x = 13,179.11

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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.