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Finding the Third Proportional to 640.75 and 1,321.75

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Solution

The third proportional to 640.75 and 1,321.75 is: 2,726.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.75 : 1,321.75 = 1,321.75 : x
  2. Step 2: Convert to fraction form
    640.75/1,321.75 = 1,321.75/x
  3. Step 3: Cross multiply
    640.75x = 1,321.75 × 1,321.75
  4. Step 4: Simplify right side
    640.75x = 1,747,023.06
  5. Step 5: Solve for x
    x = 1,747,023.06/640.75
  6. Step 6: Final answer
    x = 2,726.53

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.