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Finding the Third Proportional to 3,980 and 6,375

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Solution

The third proportional to 3,980 and 6,375 is: 10,211.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980 : 6,375 = 6,375 : x
  2. Step 2: Convert to fraction form
    3,980/6,375 = 6,375/x
  3. Step 3: Cross multiply
    3,980x = 6,375 × 6,375
  4. Step 4: Simplify right side
    3,980x = 40,640,625
  5. Step 5: Solve for x
    x = 40,640,625/3,980
  6. Step 6: Final answer
    x = 10,211.21

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.