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Finding the Fourth Proportional to 680.53, 1,020.79 and 218.24

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Solution

The fourth proportional to 680.53, 1,020.79 and 218.24 is: 327.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.53 : 1,020.79 = 218.24 : x
  2. Step 2: Convert to fraction form
    680.53/1,020.79 = 218.24/x
  3. Step 3: Cross multiply
    680.53x = 1,020.79 × 218.24
  4. Step 4: Simplify right side
    680.53x = 222,777.21
  5. Step 5: Solve for x
    x = 222,777.21/680.53
  6. Step 6: Final answer
    x = 327.36

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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.