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Finding the Fourth Proportional to 381.48, 572.52 and 198.80

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Solution

The fourth proportional to 381.48, 572.52 and 198.80 is: 298.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.48 : 572.52 = 198.80 : x
  2. Step 2: Convert to fraction form
    381.48/572.52 = 198.80/x
  3. Step 3: Cross multiply
    381.48x = 572.52 × 198.80
  4. Step 4: Simplify right side
    381.48x = 113,816.98
  5. Step 5: Solve for x
    x = 113,816.98/381.48
  6. Step 6: Final answer
    x = 298.36

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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.