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Finding the Third Proportional to 8,742 and 12,857

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Solution

The third proportional to 8,742 and 12,857 is: 18,909.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,742 : 12,857 = 12,857 : x
  2. Step 2: Convert to fraction form
    8,742/12,857 = 12,857/x
  3. Step 3: Cross multiply
    8,742x = 12,857 × 12,857
  4. Step 4: Simplify right side
    8,742x = 165,302,449
  5. Step 5: Solve for x
    x = 165,302,449/8,742
  6. Step 6: Final answer
    x = 18,909.00

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.