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Finding the Fourth Proportional to 381.09, 570.95 and 198.69

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Solution

The fourth proportional to 381.09, 570.95 and 198.69 is: 297.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.09 : 570.95 = 198.69 : x
  2. Step 2: Convert to fraction form
    381.09/570.95 = 198.69/x
  3. Step 3: Cross multiply
    381.09x = 570.95 × 198.69
  4. Step 4: Simplify right side
    381.09x = 113,441.06
  5. Step 5: Solve for x
    x = 113,441.06/381.09
  6. Step 6: Final answer
    x = 297.68

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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.