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Finding the Fourth Proportional to 789.11, 1,183.80 and 642.52

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Solution

The fourth proportional to 789.11, 1,183.80 and 642.52 is: 963.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.11 : 1,183.80 = 642.52 : x
  2. Step 2: Convert to fraction form
    789.11/1,183.80 = 642.52/x
  3. Step 3: Cross multiply
    789.11x = 1,183.80 × 642.52
  4. Step 4: Simplify right side
    789.11x = 760,610.72
  5. Step 5: Solve for x
    x = 760,610.72/789.11
  6. Step 6: Final answer
    x = 963.88

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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.