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Finding the Third Proportional to 209.50 and 285

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Solution

The third proportional to 209.50 and 285 is: 387.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.50 : 285 = 285 : x
  2. Step 2: Convert to fraction form
    209.50/285 = 285/x
  3. Step 3: Cross multiply
    209.50x = 285 × 285
  4. Step 4: Simplify right side
    209.50x = 81,225
  5. Step 5: Solve for x
    x = 81,225/209.50
  6. Step 6: Final answer
    x = 387.71

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.