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Finding the Fourth Proportional to 399.45, 550.76 and 344.09

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Solution

The fourth proportional to 399.45, 550.76 and 344.09 is: 474.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.45 : 550.76 = 344.09 : x
  2. Step 2: Convert to fraction form
    399.45/550.76 = 344.09/x
  3. Step 3: Cross multiply
    399.45x = 550.76 × 344.09
  4. Step 4: Simplify right side
    399.45x = 189,506.53
  5. Step 5: Solve for x
    x = 189,506.53/399.45
  6. Step 6: Final answer
    x = 474.42

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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.