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Finding the Third Proportional to 3,890 and 6,379

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Solution

The third proportional to 3,890 and 6,379 is: 10,460.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890 : 6,379 = 6,379 : x
  2. Step 2: Convert to fraction form
    3,890/6,379 = 6,379/x
  3. Step 3: Cross multiply
    3,890x = 6,379 × 6,379
  4. Step 4: Simplify right side
    3,890x = 40,691,641
  5. Step 5: Solve for x
    x = 40,691,641/3,890
  6. Step 6: Final answer
    x = 10,460.58

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.