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Finding the Third Proportional to 4,978 and 11,981

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Solution

The third proportional to 4,978 and 11,981 is: 28,835.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978 : 11,981 = 11,981 : x
  2. Step 2: Convert to fraction form
    4,978/11,981 = 11,981/x
  3. Step 3: Cross multiply
    4,978x = 11,981 × 11,981
  4. Step 4: Simplify right side
    4,978x = 143,544,361
  5. Step 5: Solve for x
    x = 143,544,361/4,978
  6. Step 6: Final answer
    x = 28,835.75

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.