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Finding the Fourth Proportional to 408.02, 611.82 and 213.02

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Solution

The fourth proportional to 408.02, 611.82 and 213.02 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.02 : 611.82 = 213.02 : x
  2. Step 2: Convert to fraction form
    408.02/611.82 = 213.02/x
  3. Step 3: Cross multiply
    408.02x = 611.82 × 213.02
  4. Step 4: Simplify right side
    408.02x = 130,329.90
  5. Step 5: Solve for x
    x = 130,329.90/408.02
  6. Step 6: Final answer
    x = 319.42

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.