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Finding the Third Proportional to 12,407 and 18,638

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Solution

The third proportional to 12,407 and 18,638 is: 27,998.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,407 : 18,638 = 18,638 : x
  2. Step 2: Convert to fraction form
    12,407/18,638 = 18,638/x
  3. Step 3: Cross multiply
    12,407x = 18,638 × 18,638
  4. Step 4: Simplify right side
    12,407x = 347,375,044
  5. Step 5: Solve for x
    x = 347,375,044/12,407
  6. Step 6: Final answer
    x = 27,998.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.