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Finding the Third Proportional to 221.75 and 355.38

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Solution

The third proportional to 221.75 and 355.38 is: 569.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.75 : 355.38 = 355.38 : x
  2. Step 2: Convert to fraction form
    221.75/355.38 = 355.38/x
  3. Step 3: Cross multiply
    221.75x = 355.38 × 355.38
  4. Step 4: Simplify right side
    221.75x = 126,291.39
  5. Step 5: Solve for x
    x = 126,291.39/221.75
  6. Step 6: Final answer
    x = 569.52

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.