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Finding the Third Proportional to 321.56 and 670.31

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Solution

The third proportional to 321.56 and 670.31 is: 1,397.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.56 : 670.31 = 670.31 : x
  2. Step 2: Convert to fraction form
    321.56/670.31 = 670.31/x
  3. Step 3: Cross multiply
    321.56x = 670.31 × 670.31
  4. Step 4: Simplify right side
    321.56x = 449,318.85
  5. Step 5: Solve for x
    x = 449,318.85/321.56
  6. Step 6: Final answer
    x = 1,397.30

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.