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Finding the Third Proportional to 8,678 and 13,221

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Solution

The third proportional to 8,678 and 13,221 is: 20,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678 : 13,221 = 13,221 : x
  2. Step 2: Convert to fraction form
    8,678/13,221 = 13,221/x
  3. Step 3: Cross multiply
    8,678x = 13,221 × 13,221
  4. Step 4: Simplify right side
    8,678x = 174,794,841
  5. Step 5: Solve for x
    x = 174,794,841/8,678
  6. Step 6: Final answer
    x = 20,142.30

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.