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Finding the Fourth Proportional to 721.91, 1,082.11 and 331.44

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Solution

The fourth proportional to 721.91, 1,082.11 and 331.44 is: 496.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.91 : 1,082.11 = 331.44 : x
  2. Step 2: Convert to fraction form
    721.91/1,082.11 = 331.44/x
  3. Step 3: Cross multiply
    721.91x = 1,082.11 × 331.44
  4. Step 4: Simplify right side
    721.91x = 358,656.36
  5. Step 5: Solve for x
    x = 358,656.36/721.91
  6. Step 6: Final answer
    x = 496.81

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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.