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Finding the Fourth Proportional to 680.64, 1,020.96 and 218.42

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Solution

The fourth proportional to 680.64, 1,020.96 and 218.42 is: 327.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.64 : 1,020.96 = 218.42 : x
  2. Step 2: Convert to fraction form
    680.64/1,020.96 = 218.42/x
  3. Step 3: Cross multiply
    680.64x = 1,020.96 × 218.42
  4. Step 4: Simplify right side
    680.64x = 222,997.54
  5. Step 5: Solve for x
    x = 222,997.54/680.64
  6. Step 6: Final answer
    x = 327.63

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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.