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Finding the Third Proportional to 11,991 and 18,771

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Solution

The third proportional to 11,991 and 18,771 is: 29,384.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991 : 18,771 = 18,771 : x
  2. Step 2: Convert to fraction form
    11,991/18,771 = 18,771/x
  3. Step 3: Cross multiply
    11,991x = 18,771 × 18,771
  4. Step 4: Simplify right side
    11,991x = 352,350,441
  5. Step 5: Solve for x
    x = 352,350,441/11,991
  6. Step 6: Final answer
    x = 29,384.58

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.