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Finding the Third Proportional to 11,917 and 18,899

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Solution

The third proportional to 11,917 and 18,899 is: 29,971.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,917 : 18,899 = 18,899 : x
  2. Step 2: Convert to fraction form
    11,917/18,899 = 18,899/x
  3. Step 3: Cross multiply
    11,917x = 18,899 × 18,899
  4. Step 4: Simplify right side
    11,917x = 357,172,201
  5. Step 5: Solve for x
    x = 357,172,201/11,917
  6. Step 6: Final answer
    x = 29,971.65

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.