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Finding the Fourth Proportional to 789.57, 1,183.91 and 269.31

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Solution

The fourth proportional to 789.57, 1,183.91 and 269.31 is: 403.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.57 : 1,183.91 = 269.31 : x
  2. Step 2: Convert to fraction form
    789.57/1,183.91 = 269.31/x
  3. Step 3: Cross multiply
    789.57x = 1,183.91 × 269.31
  4. Step 4: Simplify right side
    789.57x = 318,837.46
  5. Step 5: Solve for x
    x = 318,837.46/789.57
  6. Step 6: Final answer
    x = 403.81

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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.