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Finding the Fourth Proportional to 399.56, 600.39 and 217.09

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Solution

The fourth proportional to 399.56, 600.39 and 217.09 is: 326.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.56 : 600.39 = 217.09 : x
  2. Step 2: Convert to fraction form
    399.56/600.39 = 217.09/x
  3. Step 3: Cross multiply
    399.56x = 600.39 × 217.09
  4. Step 4: Simplify right side
    399.56x = 130,338.67
  5. Step 5: Solve for x
    x = 130,338.67/399.56
  6. Step 6: Final answer
    x = 326.21

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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.