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Finding the Third Proportional to 3,978 and 6,108

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Solution

The third proportional to 3,978 and 6,108 is: 9,378.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978 : 6,108 = 6,108 : x
  2. Step 2: Convert to fraction form
    3,978/6,108 = 6,108/x
  3. Step 3: Cross multiply
    3,978x = 6,108 × 6,108
  4. Step 4: Simplify right side
    3,978x = 37,307,664
  5. Step 5: Solve for x
    x = 37,307,664/3,978
  6. Step 6: Final answer
    x = 9,378.50

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.