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Finding the Fourth Proportional to 911.91, 1,366.60 and 789.87

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Solution

The fourth proportional to 911.91, 1,366.60 and 789.87 is: 1,183.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.91 : 1,366.60 = 789.87 : x
  2. Step 2: Convert to fraction form
    911.91/1,366.60 = 789.87/x
  3. Step 3: Cross multiply
    911.91x = 1,366.60 × 789.87
  4. Step 4: Simplify right side
    911.91x = 1,079,427.53
  5. Step 5: Solve for x
    x = 1,079,427.53/911.91
  6. Step 6: Final answer
    x = 1,183.71

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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.