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Finding the Fourth Proportional to 721.98, 996.66 and 423.18

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Solution

The fourth proportional to 721.98, 996.66 and 423.18 is: 584.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.98 : 996.66 = 423.18 : x
  2. Step 2: Convert to fraction form
    721.98/996.66 = 423.18/x
  3. Step 3: Cross multiply
    721.98x = 996.66 × 423.18
  4. Step 4: Simplify right side
    721.98x = 421,768.01
  5. Step 5: Solve for x
    x = 421,768.01/721.98
  6. Step 6: Final answer
    x = 584.19

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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.