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Finding the Third Proportional to 331.31 and 644.91

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Solution

The third proportional to 331.31 and 644.91 is: 1,255.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.31 : 644.91 = 644.91 : x
  2. Step 2: Convert to fraction form
    331.31/644.91 = 644.91/x
  3. Step 3: Cross multiply
    331.31x = 644.91 × 644.91
  4. Step 4: Simplify right side
    331.31x = 415,904.07
  5. Step 5: Solve for x
    x = 415,904.07/331.31
  6. Step 6: Final answer
    x = 1,255.32

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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.