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Finding the Fourth Proportional to 863.85, 1,295.96 and 278.88

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Solution

The fourth proportional to 863.85, 1,295.96 and 278.88 is: 418.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.85 : 1,295.96 = 278.88 : x
  2. Step 2: Convert to fraction form
    863.85/1,295.96 = 278.88/x
  3. Step 3: Cross multiply
    863.85x = 1,295.96 × 278.88
  4. Step 4: Simplify right side
    863.85x = 361,414.72
  5. Step 5: Solve for x
    x = 361,414.72/863.85
  6. Step 6: Final answer
    x = 418.38

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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.