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Finding the Fourth Proportional to 721.66, 1,082.12 and 259.37

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Solution

The fourth proportional to 721.66, 1,082.12 and 259.37 is: 388.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.66 : 1,082.12 = 259.37 : x
  2. Step 2: Convert to fraction form
    721.66/1,082.12 = 259.37/x
  3. Step 3: Cross multiply
    721.66x = 1,082.12 × 259.37
  4. Step 4: Simplify right side
    721.66x = 280,664.70
  5. Step 5: Solve for x
    x = 280,664.70/721.66
  6. Step 6: Final answer
    x = 388.92

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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.