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Finding the Third Proportional to 278.75 and 329.75

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Solution

The third proportional to 278.75 and 329.75 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 329.75 = 329.75 : x
  2. Step 2: Convert to fraction form
    278.75/329.75 = 329.75/x
  3. Step 3: Cross multiply
    278.75x = 329.75 × 329.75
  4. Step 4: Simplify right side
    278.75x = 108,735.06
  5. Step 5: Solve for x
    x = 108,735.06/278.75
  6. Step 6: Final answer
    x = 390.08

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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.