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Finding the Fourth Proportional to 408.20, 611.66 and 243.34

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Solution

The fourth proportional to 408.20, 611.66 and 243.34 is: 364.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.20 : 611.66 = 243.34 : x
  2. Step 2: Convert to fraction form
    408.20/611.66 = 243.34/x
  3. Step 3: Cross multiply
    408.20x = 611.66 × 243.34
  4. Step 4: Simplify right side
    408.20x = 148,840.42
  5. Step 5: Solve for x
    x = 148,840.42/408.20
  6. Step 6: Final answer
    x = 364.63

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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.