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Finding the Third Proportional to 3,978 and 6,291

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Solution

The third proportional to 3,978 and 6,291 is: 9,948.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978 : 6,291 = 6,291 : x
  2. Step 2: Convert to fraction form
    3,978/6,291 = 6,291/x
  3. Step 3: Cross multiply
    3,978x = 6,291 × 6,291
  4. Step 4: Simplify right side
    3,978x = 39,576,681
  5. Step 5: Solve for x
    x = 39,576,681/3,978
  6. Step 6: Final answer
    x = 9,948.89

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.