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Finding the Fourth Proportional to 381.19, 572.09 and 198.64

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Solution

The fourth proportional to 381.19, 572.09 and 198.64 is: 298.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.19 : 572.09 = 198.64 : x
  2. Step 2: Convert to fraction form
    381.19/572.09 = 198.64/x
  3. Step 3: Cross multiply
    381.19x = 572.09 × 198.64
  4. Step 4: Simplify right side
    381.19x = 113,637.53
  5. Step 5: Solve for x
    x = 113,637.53/381.19
  6. Step 6: Final answer
    x = 298.11

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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.