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Finding the Fourth Proportional to 611.48, 843.85 and 331.72

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Solution

The fourth proportional to 611.48, 843.85 and 331.72 is: 457.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.48 : 843.85 = 331.72 : x
  2. Step 2: Convert to fraction form
    611.48/843.85 = 331.72/x
  3. Step 3: Cross multiply
    611.48x = 843.85 × 331.72
  4. Step 4: Simplify right side
    611.48x = 279,921.92
  5. Step 5: Solve for x
    x = 279,921.92/611.48
  6. Step 6: Final answer
    x = 457.78

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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.