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Finding the Third Proportional to 12,906 and 18,981

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Solution

The third proportional to 12,906 and 18,981 is: 27,915.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,906 : 18,981 = 18,981 : x
  2. Step 2: Convert to fraction form
    12,906/18,981 = 18,981/x
  3. Step 3: Cross multiply
    12,906x = 18,981 × 18,981
  4. Step 4: Simplify right side
    12,906x = 360,278,361
  5. Step 5: Solve for x
    x = 360,278,361/12,906
  6. Step 6: Final answer
    x = 27,915.57

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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.