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Finding the Fourth Proportional to 775.29, 1,161.56 and 409.27

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Solution

The fourth proportional to 775.29, 1,161.56 and 409.27 is: 613.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.29 : 1,161.56 = 409.27 : x
  2. Step 2: Convert to fraction form
    775.29/1,161.56 = 409.27/x
  3. Step 3: Cross multiply
    775.29x = 1,161.56 × 409.27
  4. Step 4: Simplify right side
    775.29x = 475,385.85
  5. Step 5: Solve for x
    x = 475,385.85/775.29
  6. Step 6: Final answer
    x = 613.18

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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.