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Finding the Fourth Proportional to 221.63, 331.72 and 163.83

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Solution

The fourth proportional to 221.63, 331.72 and 163.83 is: 245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.63 : 331.72 = 163.83 : x
  2. Step 2: Convert to fraction form
    221.63/331.72 = 163.83/x
  3. Step 3: Cross multiply
    221.63x = 331.72 × 163.83
  4. Step 4: Simplify right side
    221.63x = 54,345.69
  5. Step 5: Solve for x
    x = 54,345.69/221.63
  6. Step 6: Final answer
    x = 245.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.