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Finding the Third Proportional to 1,991 and 4,144.75

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Solution

The third proportional to 1,991 and 4,144.75 is: 8,628.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 4,144.75 = 4,144.75 : x
  2. Step 2: Convert to fraction form
    1,991/4,144.75 = 4,144.75/x
  3. Step 3: Cross multiply
    1,991x = 4,144.75 × 4,144.75
  4. Step 4: Simplify right side
    1,991x = 17,178,952.56
  5. Step 5: Solve for x
    x = 17,178,952.56/1,991
  6. Step 6: Final answer
    x = 8,628.30

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.