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Finding the Third Proportional to 2,009 and 4,991

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Solution

The third proportional to 2,009 and 4,991 is: 12,399.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,009 : 4,991 = 4,991 : x
  2. Step 2: Convert to fraction form
    2,009/4,991 = 4,991/x
  3. Step 3: Cross multiply
    2,009x = 4,991 × 4,991
  4. Step 4: Simplify right side
    2,009x = 24,910,081
  5. Step 5: Solve for x
    x = 24,910,081/2,009
  6. Step 6: Final answer
    x = 12,399.24

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Why These Related Problems?

These problems maintain the same ratio (2.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.