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Finding the Third Proportional to 1,379 and 2,187

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Solution

The third proportional to 1,379 and 2,187 is: 3,468.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379 : 2,187 = 2,187 : x
  2. Step 2: Convert to fraction form
    1,379/2,187 = 2,187/x
  3. Step 3: Cross multiply
    1,379x = 2,187 × 2,187
  4. Step 4: Simplify right side
    1,379x = 4,782,969
  5. Step 5: Solve for x
    x = 4,782,969/1,379
  6. Step 6: Final answer
    x = 3,468.43

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.