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Finding the Fourth Proportional to 381.58, 571.48 and 216.81

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Solution

The fourth proportional to 381.58, 571.48 and 216.81 is: 324.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.58 : 571.48 = 216.81 : x
  2. Step 2: Convert to fraction form
    381.58/571.48 = 216.81/x
  3. Step 3: Cross multiply
    381.58x = 571.48 × 216.81
  4. Step 4: Simplify right side
    381.58x = 123,902.04
  5. Step 5: Solve for x
    x = 123,902.04/381.58
  6. Step 6: Final answer
    x = 324.71

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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.