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Finding the Fourth Proportional to 409.31, 613.18 and 226.79

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Solution

The fourth proportional to 409.31, 613.18 and 226.79 is: 339.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.31 : 613.18 = 226.79 : x
  2. Step 2: Convert to fraction form
    409.31/613.18 = 226.79/x
  3. Step 3: Cross multiply
    409.31x = 613.18 × 226.79
  4. Step 4: Simplify right side
    409.31x = 139,063.09
  5. Step 5: Solve for x
    x = 139,063.09/409.31
  6. Step 6: Final answer
    x = 339.75

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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.