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Finding the Fourth Proportional to 221.57, 331.17 and 163.46

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Solution

The fourth proportional to 221.57, 331.17 and 163.46 is: 244.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.57 : 331.17 = 163.46 : x
  2. Step 2: Convert to fraction form
    221.57/331.17 = 163.46/x
  3. Step 3: Cross multiply
    221.57x = 331.17 × 163.46
  4. Step 4: Simplify right side
    221.57x = 54,131.39
  5. Step 5: Solve for x
    x = 54,131.39/221.57
  6. Step 6: Final answer
    x = 244.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.