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Finding the Third Proportional to 644.50 and 1,393

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Solution

The third proportional to 644.50 and 1,393 is: 3,010.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 1,393 = 1,393 : x
  2. Step 2: Convert to fraction form
    644.50/1,393 = 1,393/x
  3. Step 3: Cross multiply
    644.50x = 1,393 × 1,393
  4. Step 4: Simplify right side
    644.50x = 1,940,449
  5. Step 5: Solve for x
    x = 1,940,449/644.50
  6. Step 6: Final answer
    x = 3,010.78

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.