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Finding the Third Proportional to 251.75 and 396.50

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Solution

The third proportional to 251.75 and 396.50 is: 624.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.75 : 396.50 = 396.50 : x
  2. Step 2: Convert to fraction form
    251.75/396.50 = 396.50/x
  3. Step 3: Cross multiply
    251.75x = 396.50 × 396.50
  4. Step 4: Simplify right side
    251.75x = 157,212.25
  5. Step 5: Solve for x
    x = 157,212.25/251.75
  6. Step 6: Final answer
    x = 624.48

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.