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Finding the Third Proportional to 321 and 368

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Solution

The third proportional to 321 and 368 is: 421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 368 = 368 : x
  2. Step 2: Convert to fraction form
    321/368 = 368/x
  3. Step 3: Cross multiply
    321x = 368 × 368
  4. Step 4: Simplify right side
    321x = 135,424
  5. Step 5: Solve for x
    x = 135,424/321
  6. Step 6: Final answer
    x = 421.88

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.