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Finding the Fourth Proportional to 323.10, 445.60 and 198.74

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Solution

The fourth proportional to 323.10, 445.60 and 198.74 is: 274.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.10 : 445.60 = 198.74 : x
  2. Step 2: Convert to fraction form
    323.10/445.60 = 198.74/x
  3. Step 3: Cross multiply
    323.10x = 445.60 × 198.74
  4. Step 4: Simplify right side
    323.10x = 88,558.54
  5. Step 5: Solve for x
    x = 88,558.54/323.10
  6. Step 6: Final answer
    x = 274.09

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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.