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Finding the Third Proportional to 3,986 and 7,872

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Solution

The third proportional to 3,986 and 7,872 is: 15,546.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986 : 7,872 = 7,872 : x
  2. Step 2: Convert to fraction form
    3,986/7,872 = 7,872/x
  3. Step 3: Cross multiply
    3,986x = 7,872 × 7,872
  4. Step 4: Simplify right side
    3,986x = 61,968,384
  5. Step 5: Solve for x
    x = 61,968,384/3,986
  6. Step 6: Final answer
    x = 15,546.51

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.