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Finding the Fourth Proportional to 400.32, 600.39 and 385.20

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Solution

The fourth proportional to 400.32, 600.39 and 385.20 is: 577.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.32 : 600.39 = 385.20 : x
  2. Step 2: Convert to fraction form
    400.32/600.39 = 385.20/x
  3. Step 3: Cross multiply
    400.32x = 600.39 × 385.20
  4. Step 4: Simplify right side
    400.32x = 231,270.23
  5. Step 5: Solve for x
    x = 231,270.23/400.32
  6. Step 6: Final answer
    x = 577.71

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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.