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Finding the Fourth Proportional to 221.47, 331.55 and 163.95

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Solution

The fourth proportional to 221.47, 331.55 and 163.95 is: 245.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.47 : 331.55 = 163.95 : x
  2. Step 2: Convert to fraction form
    221.47/331.55 = 163.95/x
  3. Step 3: Cross multiply
    221.47x = 331.55 × 163.95
  4. Step 4: Simplify right side
    221.47x = 54,356.17
  5. Step 5: Solve for x
    x = 54,356.17/221.47
  6. Step 6: Final answer
    x = 245.44

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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.