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Finding the Fourth Proportional to 721.63, 1,082.13 and 259.39

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Solution

The fourth proportional to 721.63, 1,082.13 and 259.39 is: 388.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.63 : 1,082.13 = 259.39 : x
  2. Step 2: Convert to fraction form
    721.63/1,082.13 = 259.39/x
  3. Step 3: Cross multiply
    721.63x = 1,082.13 × 259.39
  4. Step 4: Simplify right side
    721.63x = 280,693.70
  5. Step 5: Solve for x
    x = 280,693.70/721.63
  6. Step 6: Final answer
    x = 388.97

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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.