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Finding the Fourth Proportional to 721.97, 1,082.99 and 259.73

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Solution

The fourth proportional to 721.97, 1,082.99 and 259.73 is: 389.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.97 : 1,082.99 = 259.73 : x
  2. Step 2: Convert to fraction form
    721.97/1,082.99 = 259.73/x
  3. Step 3: Cross multiply
    721.97x = 1,082.99 × 259.73
  4. Step 4: Simplify right side
    721.97x = 281,278.28
  5. Step 5: Solve for x
    x = 281,278.28/721.97
  6. Step 6: Final answer
    x = 389.60

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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.