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Finding the Fourth Proportional to 789.20, 1,183.84 and 545.52

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Solution

The fourth proportional to 789.20, 1,183.84 and 545.52 is: 818.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.20 : 1,183.84 = 545.52 : x
  2. Step 2: Convert to fraction form
    789.20/1,183.84 = 545.52/x
  3. Step 3: Cross multiply
    789.20x = 1,183.84 × 545.52
  4. Step 4: Simplify right side
    789.20x = 645,808.40
  5. Step 5: Solve for x
    x = 645,808.40/789.20
  6. Step 6: Final answer
    x = 818.31

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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.