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Finding the Fourth Proportional to 611.20, 843.45 and 331.43

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Solution

The fourth proportional to 611.20, 843.45 and 331.43 is: 457.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.20 : 843.45 = 331.43 : x
  2. Step 2: Convert to fraction form
    611.20/843.45 = 331.43/x
  3. Step 3: Cross multiply
    611.20x = 843.45 × 331.43
  4. Step 4: Simplify right side
    611.20x = 279,546.93
  5. Step 5: Solve for x
    x = 279,546.93/611.20
  6. Step 6: Final answer
    x = 457.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.