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Finding the Third Proportional to 278 and 329

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Solution

The third proportional to 278 and 329 is: 389.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    278 : 329 = 329 : x
  2. Step 2: Convert to fraction form
    278/329 = 329/x
  3. Step 3: Cross multiply
    278x = 329 × 329
  4. Step 4: Simplify right side
    278x = 108,241
  5. Step 5: Solve for x
    x = 108,241/278
  6. Step 6: Final answer
    x = 389.36

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.