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Finding the Fourth Proportional to 381.81, 573.02 and 217.38

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Solution

The fourth proportional to 381.81, 573.02 and 217.38 is: 326.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.81 : 573.02 = 217.38 : x
  2. Step 2: Convert to fraction form
    381.81/573.02 = 217.38/x
  3. Step 3: Cross multiply
    381.81x = 573.02 × 217.38
  4. Step 4: Simplify right side
    381.81x = 124,563.09
  5. Step 5: Solve for x
    x = 124,563.09/381.81
  6. Step 6: Final answer
    x = 326.24

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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.