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Finding the Fourth Proportional to 408.02, 611.67 and 212.75

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Solution

The fourth proportional to 408.02, 611.67 and 212.75 is: 318.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.02 : 611.67 = 212.75 : x
  2. Step 2: Convert to fraction form
    408.02/611.67 = 212.75/x
  3. Step 3: Cross multiply
    408.02x = 611.67 × 212.75
  4. Step 4: Simplify right side
    408.02x = 130,132.79
  5. Step 5: Solve for x
    x = 130,132.79/408.02
  6. Step 6: Final answer
    x = 318.94

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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.