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Finding the Third Proportional to 7,644 and 11,979

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Solution

The third proportional to 7,644 and 11,979 is: 18,772.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,644 : 11,979 = 11,979 : x
  2. Step 2: Convert to fraction form
    7,644/11,979 = 11,979/x
  3. Step 3: Cross multiply
    7,644x = 11,979 × 11,979
  4. Step 4: Simplify right side
    7,644x = 143,496,441
  5. Step 5: Solve for x
    x = 143,496,441/7,644
  6. Step 6: Final answer
    x = 18,772.43

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.