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Finding the Fourth Proportional to 863.80, 1,185.56 and 789.64

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Solution

The fourth proportional to 863.80, 1,185.56 and 789.64 is: 1,083.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.80 : 1,185.56 = 789.64 : x
  2. Step 2: Convert to fraction form
    863.80/1,185.56 = 789.64/x
  3. Step 3: Cross multiply
    863.80x = 1,185.56 × 789.64
  4. Step 4: Simplify right side
    863.80x = 936,165.60
  5. Step 5: Solve for x
    x = 936,165.60/863.80
  6. Step 6: Final answer
    x = 1,083.78

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.