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Finding the Third Proportional to 12,306 and 18,939

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Solution

The third proportional to 12,306 and 18,939 is: 29,147.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,306 : 18,939 = 18,939 : x
  2. Step 2: Convert to fraction form
    12,306/18,939 = 18,939/x
  3. Step 3: Cross multiply
    12,306x = 18,939 × 18,939
  4. Step 4: Simplify right side
    12,306x = 358,685,721
  5. Step 5: Solve for x
    x = 358,685,721/12,306
  6. Step 6: Final answer
    x = 29,147.22

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.