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Finding the Third Proportional to 12,138 and 18,211

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Solution

The third proportional to 12,138 and 18,211 is: 27,322.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138 : 18,211 = 18,211 : x
  2. Step 2: Convert to fraction form
    12,138/18,211 = 18,211/x
  3. Step 3: Cross multiply
    12,138x = 18,211 × 18,211
  4. Step 4: Simplify right side
    12,138x = 331,640,521
  5. Step 5: Solve for x
    x = 331,640,521/12,138
  6. Step 6: Final answer
    x = 27,322.50

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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.