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Finding the Fourth Proportional to 789.66, 1,183.14 and 721.62

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Solution

The fourth proportional to 789.66, 1,183.14 and 721.62 is: 1,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.66 : 1,183.14 = 721.62 : x
  2. Step 2: Convert to fraction form
    789.66/1,183.14 = 721.62/x
  3. Step 3: Cross multiply
    789.66x = 1,183.14 × 721.62
  4. Step 4: Simplify right side
    789.66x = 853,777.49
  5. Step 5: Solve for x
    x = 853,777.49/789.66
  6. Step 6: Final answer
    x = 1,081.20

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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.