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Finding the Fourth Proportional to 789.21, 1,183.51 and 378.54

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Solution

The fourth proportional to 789.21, 1,183.51 and 378.54 is: 567.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.21 : 1,183.51 = 378.54 : x
  2. Step 2: Convert to fraction form
    789.21/1,183.51 = 378.54/x
  3. Step 3: Cross multiply
    789.21x = 1,183.51 × 378.54
  4. Step 4: Simplify right side
    789.21x = 448,005.88
  5. Step 5: Solve for x
    x = 448,005.88/789.21
  6. Step 6: Final answer
    x = 567.66

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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.