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Finding the Third Proportional to 1,221 and 2,379

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Solution

The third proportional to 1,221 and 2,379 is: 4,635.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221 : 2,379 = 2,379 : x
  2. Step 2: Convert to fraction form
    1,221/2,379 = 2,379/x
  3. Step 3: Cross multiply
    1,221x = 2,379 × 2,379
  4. Step 4: Simplify right side
    1,221x = 5,659,641
  5. Step 5: Solve for x
    x = 5,659,641/1,221
  6. Step 6: Final answer
    x = 4,635.25

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.