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Finding the Fourth Proportional to 793.45, 1,189.80 and 331.09

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Solution

The fourth proportional to 793.45, 1,189.80 and 331.09 is: 496.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.45 : 1,189.80 = 331.09 : x
  2. Step 2: Convert to fraction form
    793.45/1,189.80 = 331.09/x
  3. Step 3: Cross multiply
    793.45x = 1,189.80 × 331.09
  4. Step 4: Simplify right side
    793.45x = 393,930.88
  5. Step 5: Solve for x
    x = 393,930.88/793.45
  6. Step 6: Final answer
    x = 496.48

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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.