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Finding the Fourth Proportional to 221.96, 331.31 and 193.28

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Solution

The fourth proportional to 221.96, 331.31 and 193.28 is: 288.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.96 : 331.31 = 193.28 : x
  2. Step 2: Convert to fraction form
    221.96/331.31 = 193.28/x
  3. Step 3: Cross multiply
    221.96x = 331.31 × 193.28
  4. Step 4: Simplify right side
    221.96x = 64,035.60
  5. Step 5: Solve for x
    x = 64,035.60/221.96
  6. Step 6: Final answer
    x = 288.50

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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.