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Finding the Fourth Proportional to 481.42, 721.56 and 221.20

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Solution

The fourth proportional to 481.42, 721.56 and 221.20 is: 331.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.42 : 721.56 = 221.20 : x
  2. Step 2: Convert to fraction form
    481.42/721.56 = 221.20/x
  3. Step 3: Cross multiply
    481.42x = 721.56 × 221.20
  4. Step 4: Simplify right side
    481.42x = 159,607.97
  5. Step 5: Solve for x
    x = 159,607.97/481.42
  6. Step 6: Final answer
    x = 331.54

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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.