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Finding the Fourth Proportional to 481.44, 721.49 and 220.81

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Solution

The fourth proportional to 481.44, 721.49 and 220.81 is: 330.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.44 : 721.49 = 220.81 : x
  2. Step 2: Convert to fraction form
    481.44/721.49 = 220.81/x
  3. Step 3: Cross multiply
    481.44x = 721.49 × 220.81
  4. Step 4: Simplify right side
    481.44x = 159,312.21
  5. Step 5: Solve for x
    x = 159,312.21/481.44
  6. Step 6: Final answer
    x = 330.91

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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.