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Finding the Third Proportional to 3,969 and 8,991

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Solution

The third proportional to 3,969 and 8,991 is: 20,367.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969 : 8,991 = 8,991 : x
  2. Step 2: Convert to fraction form
    3,969/8,991 = 8,991/x
  3. Step 3: Cross multiply
    3,969x = 8,991 × 8,991
  4. Step 4: Simplify right side
    3,969x = 80,838,081
  5. Step 5: Solve for x
    x = 80,838,081/3,969
  6. Step 6: Final answer
    x = 20,367.37

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Why These Related Problems?

These problems maintain the same ratio (2.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.