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Finding the Third Proportional to 1,991 and 4,649

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Solution

The third proportional to 1,991 and 4,649 is: 10,855.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 4,649 = 4,649 : x
  2. Step 2: Convert to fraction form
    1,991/4,649 = 4,649/x
  3. Step 3: Cross multiply
    1,991x = 4,649 × 4,649
  4. Step 4: Simplify right side
    1,991x = 21,613,201
  5. Step 5: Solve for x
    x = 21,613,201/1,991
  6. Step 6: Final answer
    x = 10,855.45

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.