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Finding the Third Proportional to 11,876 and 18,990

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Solution

The third proportional to 11,876 and 18,990 is: 30,365.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,876 : 18,990 = 18,990 : x
  2. Step 2: Convert to fraction form
    11,876/18,990 = 18,990/x
  3. Step 3: Cross multiply
    11,876x = 18,990 × 18,990
  4. Step 4: Simplify right side
    11,876x = 360,620,100
  5. Step 5: Solve for x
    x = 360,620,100/11,876
  6. Step 6: Final answer
    x = 30,365.45

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.