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Finding the Fourth Proportional to 399.06, 550.38 and 310.44

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Solution

The fourth proportional to 399.06, 550.38 and 310.44 is: 428.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.06 : 550.38 = 310.44 : x
  2. Step 2: Convert to fraction form
    399.06/550.38 = 310.44/x
  3. Step 3: Cross multiply
    399.06x = 550.38 × 310.44
  4. Step 4: Simplify right side
    399.06x = 170,859.97
  5. Step 5: Solve for x
    x = 170,859.97/399.06
  6. Step 6: Final answer
    x = 428.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.