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Finding the Third Proportional to 12,678.38 and 18,021

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Solution

The third proportional to 12,678.38 and 18,021 is: 25,614.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.38 : 18,021 = 18,021 : x
  2. Step 2: Convert to fraction form
    12,678.38/18,021 = 18,021/x
  3. Step 3: Cross multiply
    12,678.38x = 18,021 × 18,021
  4. Step 4: Simplify right side
    12,678.38x = 324,756,441
  5. Step 5: Solve for x
    x = 324,756,441/12,678.38
  6. Step 6: Final answer
    x = 25,614.99

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.