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Finding the Third Proportional to 278.75 and 396.50

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Solution

The third proportional to 278.75 and 396.50 is: 563.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 396.50 = 396.50 : x
  2. Step 2: Convert to fraction form
    278.75/396.50 = 396.50/x
  3. Step 3: Cross multiply
    278.75x = 396.50 × 396.50
  4. Step 4: Simplify right side
    278.75x = 157,212.25
  5. Step 5: Solve for x
    x = 157,212.25/278.75
  6. Step 6: Final answer
    x = 563.99

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.