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Finding the Fourth Proportional to 380.21, 570 and 331.34

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Solution

The fourth proportional to 380.21, 570 and 331.34 is: 496.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.21 : 570 = 331.34 : x
  2. Step 2: Convert to fraction form
    380.21/570 = 331.34/x
  3. Step 3: Cross multiply
    380.21x = 570 × 331.34
  4. Step 4: Simplify right side
    380.21x = 188,863.80
  5. Step 5: Solve for x
    x = 188,863.80/380.21
  6. Step 6: Final answer
    x = 496.74

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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.