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Finding the Third Proportional to 3,980 and 6,187

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Solution

The third proportional to 3,980 and 6,187 is: 9,617.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980 : 6,187 = 6,187 : x
  2. Step 2: Convert to fraction form
    3,980/6,187 = 6,187/x
  3. Step 3: Cross multiply
    3,980x = 6,187 × 6,187
  4. Step 4: Simplify right side
    3,980x = 38,278,969
  5. Step 5: Solve for x
    x = 38,278,969/3,980
  6. Step 6: Final answer
    x = 9,617.83

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.