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Finding the Third Proportional to 2,109 and 4,542

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Solution

The third proportional to 2,109 and 4,542 is: 9,781.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109 : 4,542 = 4,542 : x
  2. Step 2: Convert to fraction form
    2,109/4,542 = 4,542/x
  3. Step 3: Cross multiply
    2,109x = 4,542 × 4,542
  4. Step 4: Simplify right side
    2,109x = 20,629,764
  5. Step 5: Solve for x
    x = 20,629,764/2,109
  6. Step 6: Final answer
    x = 9,781.78

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.