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Finding the Third Proportional to 6,390 and 11,979

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Solution

The third proportional to 6,390 and 11,979 is: 22,456.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390 : 11,979 = 11,979 : x
  2. Step 2: Convert to fraction form
    6,390/11,979 = 11,979/x
  3. Step 3: Cross multiply
    6,390x = 11,979 × 11,979
  4. Step 4: Simplify right side
    6,390x = 143,496,441
  5. Step 5: Solve for x
    x = 143,496,441/6,390
  6. Step 6: Final answer
    x = 22,456.41

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.