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Finding the Fourth Proportional to 618.20, 851.28 and 443.24

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Solution

The fourth proportional to 618.20, 851.28 and 443.24 is: 610.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.20 : 851.28 = 443.24 : x
  2. Step 2: Convert to fraction form
    618.20/851.28 = 443.24/x
  3. Step 3: Cross multiply
    618.20x = 851.28 × 443.24
  4. Step 4: Simplify right side
    618.20x = 377,321.35
  5. Step 5: Solve for x
    x = 377,321.35/618.20
  6. Step 6: Final answer
    x = 610.35

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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.