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Finding the Third Proportional to 7,938 and 11,979

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Solution

The third proportional to 7,938 and 11,979 is: 18,077.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,938 : 11,979 = 11,979 : x
  2. Step 2: Convert to fraction form
    7,938/11,979 = 11,979/x
  3. Step 3: Cross multiply
    7,938x = 11,979 × 11,979
  4. Step 4: Simplify right side
    7,938x = 143,496,441
  5. Step 5: Solve for x
    x = 143,496,441/7,938
  6. Step 6: Final answer
    x = 18,077.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.