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Finding the Third Proportional to 221 and 267.50

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Solution

The third proportional to 221 and 267.50 is: 323.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    221 : 267.50 = 267.50 : x
  2. Step 2: Convert to fraction form
    221/267.50 = 267.50/x
  3. Step 3: Cross multiply
    221x = 267.50 × 267.50
  4. Step 4: Simplify right side
    221x = 71,556.25
  5. Step 5: Solve for x
    x = 71,556.25/221
  6. Step 6: Final answer
    x = 323.78

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.