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Finding the Third Proportional to 12,872 and 20,857

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Solution

The third proportional to 12,872 and 20,857 is: 33,795.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,872 : 20,857 = 20,857 : x
  2. Step 2: Convert to fraction form
    12,872/20,857 = 20,857/x
  3. Step 3: Cross multiply
    12,872x = 20,857 × 20,857
  4. Step 4: Simplify right side
    12,872x = 435,014,449
  5. Step 5: Solve for x
    x = 435,014,449/12,872
  6. Step 6: Final answer
    x = 33,795.40

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.