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Finding the Fourth Proportional to 775.63, 1,163.69 and 255.64

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Solution

The fourth proportional to 775.63, 1,163.69 and 255.64 is: 383.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.63 : 1,163.69 = 255.64 : x
  2. Step 2: Convert to fraction form
    775.63/1,163.69 = 255.64/x
  3. Step 3: Cross multiply
    775.63x = 1,163.69 × 255.64
  4. Step 4: Simplify right side
    775.63x = 297,485.71
  5. Step 5: Solve for x
    x = 297,485.71/775.63
  6. Step 6: Final answer
    x = 383.54

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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.