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Finding the Fourth Proportional to 408.09, 611.09 and 270.72

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Solution

The fourth proportional to 408.09, 611.09 and 270.72 is: 405.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.09 : 611.09 = 270.72 : x
  2. Step 2: Convert to fraction form
    408.09/611.09 = 270.72/x
  3. Step 3: Cross multiply
    408.09x = 611.09 × 270.72
  4. Step 4: Simplify right side
    408.09x = 165,434.28
  5. Step 5: Solve for x
    x = 165,434.28/408.09
  6. Step 6: Final answer
    x = 405.39

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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.