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Finding the Fourth Proportional to 863.37, 1,295.06 and 815.85

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Solution

The fourth proportional to 863.37, 1,295.06 and 815.85 is: 1,223.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.37 : 1,295.06 = 815.85 : x
  2. Step 2: Convert to fraction form
    863.37/1,295.06 = 815.85/x
  3. Step 3: Cross multiply
    863.37x = 1,295.06 × 815.85
  4. Step 4: Simplify right side
    863.37x = 1,056,570.62
  5. Step 5: Solve for x
    x = 1,056,570.62/863.37
  6. Step 6: Final answer
    x = 1,223.78

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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.