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Finding the Third Proportional to 1,991 and 3,315

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Solution

The third proportional to 1,991 and 3,315 is: 5,519.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 3,315 = 3,315 : x
  2. Step 2: Convert to fraction form
    1,991/3,315 = 3,315/x
  3. Step 3: Cross multiply
    1,991x = 3,315 × 3,315
  4. Step 4: Simplify right side
    1,991x = 10,989,225
  5. Step 5: Solve for x
    x = 10,989,225/1,991
  6. Step 6: Final answer
    x = 5,519.45

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.