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Finding the Fourth Proportional to 793.78, 1,189.60 and 331.02

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Solution

The fourth proportional to 793.78, 1,189.60 and 331.02 is: 496.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.78 : 1,189.60 = 331.02 : x
  2. Step 2: Convert to fraction form
    793.78/1,189.60 = 331.02/x
  3. Step 3: Cross multiply
    793.78x = 1,189.60 × 331.02
  4. Step 4: Simplify right side
    793.78x = 393,780.56
  5. Step 5: Solve for x
    x = 393,780.56/793.78
  6. Step 6: Final answer
    x = 496.08

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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.