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Finding the Fourth Proportional to 721.73, 996.31 and 422.93

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Solution

The fourth proportional to 721.73, 996.31 and 422.93 is: 583.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.73 : 996.31 = 422.93 : x
  2. Step 2: Convert to fraction form
    721.73/996.31 = 422.93/x
  3. Step 3: Cross multiply
    721.73x = 996.31 × 422.93
  4. Step 4: Simplify right side
    721.73x = 421,371.69
  5. Step 5: Solve for x
    x = 421,371.69/721.73
  6. Step 6: Final answer
    x = 583.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.