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Finding the Fourth Proportional to 863.94, 1,295.28 and 278.73

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Solution

The fourth proportional to 863.94, 1,295.28 and 278.73 is: 417.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.94 : 1,295.28 = 278.73 : x
  2. Step 2: Convert to fraction form
    863.94/1,295.28 = 278.73/x
  3. Step 3: Cross multiply
    863.94x = 1,295.28 × 278.73
  4. Step 4: Simplify right side
    863.94x = 361,033.39
  5. Step 5: Solve for x
    x = 361,033.39/863.94
  6. Step 6: Final answer
    x = 417.89

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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.