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Finding the Fourth Proportional to 775.20, 1,069.56 and 443.52

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Solution

The fourth proportional to 775.20, 1,069.56 and 443.52 is: 611.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.20 : 1,069.56 = 443.52 : x
  2. Step 2: Convert to fraction form
    775.20/1,069.56 = 443.52/x
  3. Step 3: Cross multiply
    775.20x = 1,069.56 × 443.52
  4. Step 4: Simplify right side
    775.20x = 474,371.25
  5. Step 5: Solve for x
    x = 474,371.25/775.20
  6. Step 6: Final answer
    x = 611.93

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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.