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Finding the Third Proportional to 328.50 and 636.75

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Solution

The third proportional to 328.50 and 636.75 is: 1,234.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.50 : 636.75 = 636.75 : x
  2. Step 2: Convert to fraction form
    328.50/636.75 = 636.75/x
  3. Step 3: Cross multiply
    328.50x = 636.75 × 636.75
  4. Step 4: Simplify right side
    328.50x = 405,450.56
  5. Step 5: Solve for x
    x = 405,450.56/328.50
  6. Step 6: Final answer
    x = 1,234.25

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Why These Related Problems?

These problems maintain the same ratio (1.94) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.