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Finding the Fourth Proportional to 775.92, 1,163.63 and 255.81

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Solution

The fourth proportional to 775.92, 1,163.63 and 255.81 is: 383.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.92 : 1,163.63 = 255.81 : x
  2. Step 2: Convert to fraction form
    775.92/1,163.63 = 255.81/x
  3. Step 3: Cross multiply
    775.92x = 1,163.63 × 255.81
  4. Step 4: Simplify right side
    775.92x = 297,672.93
  5. Step 5: Solve for x
    x = 297,672.93/775.92
  6. Step 6: Final answer
    x = 383.64

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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.