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Finding the Third Proportional to 321.75 and 698.44

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Solution

The third proportional to 321.75 and 698.44 is: 1,516.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 698.44 = 698.44 : x
  2. Step 2: Convert to fraction form
    321.75/698.44 = 698.44/x
  3. Step 3: Cross multiply
    321.75x = 698.44 × 698.44
  4. Step 4: Simplify right side
    321.75x = 487,814.94
  5. Step 5: Solve for x
    x = 487,814.94/321.75
  6. Step 6: Final answer
    x = 1,516.13

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.