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Finding the Fourth Proportional to 409.39, 613.92 and 149.31

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Solution

The fourth proportional to 409.39, 613.92 and 149.31 is: 223.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.39 : 613.92 = 149.31 : x
  2. Step 2: Convert to fraction form
    409.39/613.92 = 149.31/x
  3. Step 3: Cross multiply
    409.39x = 613.92 × 149.31
  4. Step 4: Simplify right side
    409.39x = 91,664.96
  5. Step 5: Solve for x
    x = 91,664.96/409.39
  6. Step 6: Final answer
    x = 223.91

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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.