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Finding the Third Proportional to 324.50 and 421.75

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Solution

The third proportional to 324.50 and 421.75 is: 548.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.50 : 421.75 = 421.75 : x
  2. Step 2: Convert to fraction form
    324.50/421.75 = 421.75/x
  3. Step 3: Cross multiply
    324.50x = 421.75 × 421.75
  4. Step 4: Simplify right side
    324.50x = 177,873.06
  5. Step 5: Solve for x
    x = 177,873.06/324.50
  6. Step 6: Final answer
    x = 548.15

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.