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Finding the Fourth Proportional to 775.87, 1,163.93 and 539.42

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Solution

The fourth proportional to 775.87, 1,163.93 and 539.42 is: 809.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.87 : 1,163.93 = 539.42 : x
  2. Step 2: Convert to fraction form
    775.87/1,163.93 = 539.42/x
  3. Step 3: Cross multiply
    775.87x = 1,163.93 × 539.42
  4. Step 4: Simplify right side
    775.87x = 627,842.97
  5. Step 5: Solve for x
    x = 627,842.97/775.87
  6. Step 6: Final answer
    x = 809.21

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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.