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Finding the Third Proportional to 321.50 and 649.75

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Solution

The third proportional to 321.50 and 649.75 is: 1,313.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.50 : 649.75 = 649.75 : x
  2. Step 2: Convert to fraction form
    321.50/649.75 = 649.75/x
  3. Step 3: Cross multiply
    321.50x = 649.75 × 649.75
  4. Step 4: Simplify right side
    321.50x = 422,175.06
  5. Step 5: Solve for x
    x = 422,175.06/321.50
  6. Step 6: Final answer
    x = 1,313.14

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.