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Finding the Fourth Proportional to 775.79, 1,163.76 and 220.51

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Solution

The fourth proportional to 775.79, 1,163.76 and 220.51 is: 330.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.79 : 1,163.76 = 220.51 : x
  2. Step 2: Convert to fraction form
    775.79/1,163.76 = 220.51/x
  3. Step 3: Cross multiply
    775.79x = 1,163.76 × 220.51
  4. Step 4: Simplify right side
    775.79x = 256,613.80
  5. Step 5: Solve for x
    x = 256,613.80/775.79
  6. Step 6: Final answer
    x = 330.78

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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.