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Finding the Third Proportional to 321 and 649

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Solution

The third proportional to 321 and 649 is: 1,312.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 649 = 649 : x
  2. Step 2: Convert to fraction form
    321/649 = 649/x
  3. Step 3: Cross multiply
    321x = 649 × 649
  4. Step 4: Simplify right side
    321x = 421,201
  5. Step 5: Solve for x
    x = 421,201/321
  6. Step 6: Final answer
    x = 1,312.15

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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.