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Finding the Fourth Proportional to 408.35, 611.14 and 343.43

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Solution

The fourth proportional to 408.35, 611.14 and 343.43 is: 513.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.35 : 611.14 = 343.43 : x
  2. Step 2: Convert to fraction form
    408.35/611.14 = 343.43/x
  3. Step 3: Cross multiply
    408.35x = 611.14 × 343.43
  4. Step 4: Simplify right side
    408.35x = 209,879.90
  5. Step 5: Solve for x
    x = 209,879.90/408.35
  6. Step 6: Final answer
    x = 513.98

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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.