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Finding the Fourth Proportional to 399.16, 550.60 and 310.60

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Solution

The fourth proportional to 399.16, 550.60 and 310.60 is: 428.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.16 : 550.60 = 310.60 : x
  2. Step 2: Convert to fraction form
    399.16/550.60 = 310.60/x
  3. Step 3: Cross multiply
    399.16x = 550.60 × 310.60
  4. Step 4: Simplify right side
    399.16x = 171,016.36
  5. Step 5: Solve for x
    x = 171,016.36/399.16
  6. Step 6: Final answer
    x = 428.44

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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.