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Finding the Fourth Proportional to 611.44, 843.78 and 331.67

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Solution

The fourth proportional to 611.44, 843.78 and 331.67 is: 457.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.44 : 843.78 = 331.67 : x
  2. Step 2: Convert to fraction form
    611.44/843.78 = 331.67/x
  3. Step 3: Cross multiply
    611.44x = 843.78 × 331.67
  4. Step 4: Simplify right side
    611.44x = 279,850.64
  5. Step 5: Solve for x
    x = 279,850.64/611.44
  6. Step 6: Final answer
    x = 457.69

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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.