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Finding the Third Proportional to 211 and 328

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Solution

The third proportional to 211 and 328 is: 509.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    211 : 328 = 328 : x
  2. Step 2: Convert to fraction form
    211/328 = 328/x
  3. Step 3: Cross multiply
    211x = 328 × 328
  4. Step 4: Simplify right side
    211x = 107,584
  5. Step 5: Solve for x
    x = 107,584/211
  6. Step 6: Final answer
    x = 509.88

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.