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Finding the Fourth Proportional to 381.49, 570.71 and 330.71

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Solution

The fourth proportional to 381.49, 570.71 and 330.71 is: 494.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.49 : 570.71 = 330.71 : x
  2. Step 2: Convert to fraction form
    381.49/570.71 = 330.71/x
  3. Step 3: Cross multiply
    381.49x = 570.71 × 330.71
  4. Step 4: Simplify right side
    381.49x = 188,737.48
  5. Step 5: Solve for x
    x = 188,737.48/381.49
  6. Step 6: Final answer
    x = 494.74

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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.