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Finding the Third Proportional to 8,679 and 18,438

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Solution

The third proportional to 8,679 and 18,438 is: 39,170.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679 : 18,438 = 18,438 : x
  2. Step 2: Convert to fraction form
    8,679/18,438 = 18,438/x
  3. Step 3: Cross multiply
    8,679x = 18,438 × 18,438
  4. Step 4: Simplify right side
    8,679x = 339,959,844
  5. Step 5: Solve for x
    x = 339,959,844/8,679
  6. Step 6: Final answer
    x = 39,170.39

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.