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Finding the Third Proportional to 1,391 and 1,993

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Solution

The third proportional to 1,391 and 1,993 is: 2,855.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391 : 1,993 = 1,993 : x
  2. Step 2: Convert to fraction form
    1,391/1,993 = 1,993/x
  3. Step 3: Cross multiply
    1,391x = 1,993 × 1,993
  4. Step 4: Simplify right side
    1,391x = 3,972,049
  5. Step 5: Solve for x
    x = 3,972,049/1,391
  6. Step 6: Final answer
    x = 2,855.53

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.