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Finding the Fourth Proportional to 775.15, 1,069.37 and 443.46

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Solution

The fourth proportional to 775.15, 1,069.37 and 443.46 is: 611.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.15 : 1,069.37 = 443.46 : x
  2. Step 2: Convert to fraction form
    775.15/1,069.37 = 443.46/x
  3. Step 3: Cross multiply
    775.15x = 1,069.37 × 443.46
  4. Step 4: Simplify right side
    775.15x = 474,219.92
  5. Step 5: Solve for x
    x = 474,219.92/775.15
  6. Step 6: Final answer
    x = 611.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.