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Finding the Third Proportional to 13,779 and 21,393

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Solution

The third proportional to 13,779 and 21,393 is: 33,214.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779 : 21,393 = 21,393 : x
  2. Step 2: Convert to fraction form
    13,779/21,393 = 21,393/x
  3. Step 3: Cross multiply
    13,779x = 21,393 × 21,393
  4. Step 4: Simplify right side
    13,779x = 457,660,449
  5. Step 5: Solve for x
    x = 457,660,449/13,779
  6. Step 6: Final answer
    x = 33,214.34

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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.