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Finding the Fourth Proportional to 789.46, 1,183.88 and 378.79

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Solution

The fourth proportional to 789.46, 1,183.88 and 378.79 is: 568.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.46 : 1,183.88 = 378.79 : x
  2. Step 2: Convert to fraction form
    789.46/1,183.88 = 378.79/x
  3. Step 3: Cross multiply
    789.46x = 1,183.88 × 378.79
  4. Step 4: Simplify right side
    789.46x = 448,439.89
  5. Step 5: Solve for x
    x = 448,439.89/789.46
  6. Step 6: Final answer
    x = 568.04

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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.