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Finding the Third Proportional to 209.75 and 439.75

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Solution

The third proportional to 209.75 and 439.75 is: 921.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.75 : 439.75 = 439.75 : x
  2. Step 2: Convert to fraction form
    209.75/439.75 = 439.75/x
  3. Step 3: Cross multiply
    209.75x = 439.75 × 439.75
  4. Step 4: Simplify right side
    209.75x = 193,380.06
  5. Step 5: Solve for x
    x = 193,380.06/209.75
  6. Step 6: Final answer
    x = 921.96

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.