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Finding the Third Proportional to 13,678 and 20,917

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Solution

The third proportional to 13,678 and 20,917 is: 31,987.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,678 : 20,917 = 20,917 : x
  2. Step 2: Convert to fraction form
    13,678/20,917 = 20,917/x
  3. Step 3: Cross multiply
    13,678x = 20,917 × 20,917
  4. Step 4: Simplify right side
    13,678x = 437,520,889
  5. Step 5: Solve for x
    x = 437,520,889/13,678
  6. Step 6: Final answer
    x = 31,987.20

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.