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Finding the Fourth Proportional to 863.75, 1,295.76 and 278.56

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Solution

The fourth proportional to 863.75, 1,295.76 and 278.56 is: 417.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.75 : 1,295.76 = 278.56 : x
  2. Step 2: Convert to fraction form
    863.75/1,295.76 = 278.56/x
  3. Step 3: Cross multiply
    863.75x = 1,295.76 × 278.56
  4. Step 4: Simplify right side
    863.75x = 360,939.03
  5. Step 5: Solve for x
    x = 360,939.03/863.75
  6. Step 6: Final answer
    x = 417.87

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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.