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Finding the Third Proportional to 8,122 and 12,138

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Solution

The third proportional to 8,122 and 12,138 is: 18,139.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,122 : 12,138 = 12,138 : x
  2. Step 2: Convert to fraction form
    8,122/12,138 = 12,138/x
  3. Step 3: Cross multiply
    8,122x = 12,138 × 12,138
  4. Step 4: Simplify right side
    8,122x = 147,331,044
  5. Step 5: Solve for x
    x = 147,331,044/8,122
  6. Step 6: Final answer
    x = 18,139.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.