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Finding the Third Proportional to 7,728 and 11,992

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Solution

The third proportional to 7,728 and 11,992 is: 18,608.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,728 : 11,992 = 11,992 : x
  2. Step 2: Convert to fraction form
    7,728/11,992 = 11,992/x
  3. Step 3: Cross multiply
    7,728x = 11,992 × 11,992
  4. Step 4: Simplify right side
    7,728x = 143,808,064
  5. Step 5: Solve for x
    x = 143,808,064/7,728
  6. Step 6: Final answer
    x = 18,608.70

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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.