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Finding the Fourth Proportional to 381.16, 571.42 and 330.40

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Solution

The fourth proportional to 381.16, 571.42 and 330.40 is: 495.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.16 : 571.42 = 330.40 : x
  2. Step 2: Convert to fraction form
    381.16/571.42 = 330.40/x
  3. Step 3: Cross multiply
    381.16x = 571.42 × 330.40
  4. Step 4: Simplify right side
    381.16x = 188,797.17
  5. Step 5: Solve for x
    x = 188,797.17/381.16
  6. Step 6: Final answer
    x = 495.32

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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.