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Finding the Fourth Proportional to 789.12, 1,183.68 and 423.84

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Solution

The fourth proportional to 789.12, 1,183.68 and 423.84 is: 635.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.12 : 1,183.68 = 423.84 : x
  2. Step 2: Convert to fraction form
    789.12/1,183.68 = 423.84/x
  3. Step 3: Cross multiply
    789.12x = 1,183.68 × 423.84
  4. Step 4: Simplify right side
    789.12x = 501,690.93
  5. Step 5: Solve for x
    x = 501,690.93/789.12
  6. Step 6: Final answer
    x = 635.76

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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.