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Finding the Fourth Proportional to 789.20, 1,183.37 and 658.49

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Solution

The fourth proportional to 789.20, 1,183.37 and 658.49 is: 987.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.20 : 1,183.37 = 658.49 : x
  2. Step 2: Convert to fraction form
    789.20/1,183.37 = 658.49/x
  3. Step 3: Cross multiply
    789.20x = 1,183.37 × 658.49
  4. Step 4: Simplify right side
    789.20x = 779,241.05
  5. Step 5: Solve for x
    x = 779,241.05/789.20
  6. Step 6: Final answer
    x = 987.38

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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.