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Finding the Third Proportional to 12,886 and 19,911

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Solution

The third proportional to 12,886 and 19,911 is: 30,765.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,886 : 19,911 = 19,911 : x
  2. Step 2: Convert to fraction form
    12,886/19,911 = 19,911/x
  3. Step 3: Cross multiply
    12,886x = 19,911 × 19,911
  4. Step 4: Simplify right side
    12,886x = 396,447,921
  5. Step 5: Solve for x
    x = 396,447,921/12,886
  6. Step 6: Final answer
    x = 30,765.79

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.