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Finding the Fourth Proportional to 381.25, 571.24 and 218.53

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Solution

The fourth proportional to 381.25, 571.24 and 218.53 is: 327.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.25 : 571.24 = 218.53 : x
  2. Step 2: Convert to fraction form
    381.25/571.24 = 218.53/x
  3. Step 3: Cross multiply
    381.25x = 571.24 × 218.53
  4. Step 4: Simplify right side
    381.25x = 124,829.13
  5. Step 5: Solve for x
    x = 124,829.13/381.25
  6. Step 6: Final answer
    x = 327.42

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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.