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Finding the Third Proportional to 13,855 and 20,779

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Solution

The third proportional to 13,855 and 20,779 is: 31,163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,855 : 20,779 = 20,779 : x
  2. Step 2: Convert to fraction form
    13,855/20,779 = 20,779/x
  3. Step 3: Cross multiply
    13,855x = 20,779 × 20,779
  4. Step 4: Simplify right side
    13,855x = 431,766,841
  5. Step 5: Solve for x
    x = 431,766,841/13,855
  6. Step 6: Final answer
    x = 31,163.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.