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Finding the Fourth Proportional to 721.94, 1,082.92 and 311.08

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Solution

The fourth proportional to 721.94, 1,082.92 and 311.08 is: 466.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.94 : 1,082.92 = 311.08 : x
  2. Step 2: Convert to fraction form
    721.94/1,082.92 = 311.08/x
  3. Step 3: Cross multiply
    721.94x = 1,082.92 × 311.08
  4. Step 4: Simplify right side
    721.94x = 336,874.75
  5. Step 5: Solve for x
    x = 336,874.75/721.94
  6. Step 6: Final answer
    x = 466.62

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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.