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Finding the Third Proportional to 278.75 and 329.25

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Solution

The third proportional to 278.75 and 329.25 is: 388.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 329.25 = 329.25 : x
  2. Step 2: Convert to fraction form
    278.75/329.25 = 329.25/x
  3. Step 3: Cross multiply
    278.75x = 329.25 × 329.25
  4. Step 4: Simplify right side
    278.75x = 108,405.56
  5. Step 5: Solve for x
    x = 108,405.56/278.75
  6. Step 6: Final answer
    x = 388.90

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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.