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Finding the Fourth Proportional to 403.94, 606.08 and 198.64

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Solution

The fourth proportional to 403.94, 606.08 and 198.64 is: 298.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.94 : 606.08 = 198.64 : x
  2. Step 2: Convert to fraction form
    403.94/606.08 = 198.64/x
  3. Step 3: Cross multiply
    403.94x = 606.08 × 198.64
  4. Step 4: Simplify right side
    403.94x = 120,391.73
  5. Step 5: Solve for x
    x = 120,391.73/403.94
  6. Step 6: Final answer
    x = 298.04

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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.