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Finding the Fourth Proportional to 680.56, 1,020.36 and 218.18

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Solution

The fourth proportional to 680.56, 1,020.36 and 218.18 is: 327.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.56 : 1,020.36 = 218.18 : x
  2. Step 2: Convert to fraction form
    680.56/1,020.36 = 218.18/x
  3. Step 3: Cross multiply
    680.56x = 1,020.36 × 218.18
  4. Step 4: Simplify right side
    680.56x = 222,622.14
  5. Step 5: Solve for x
    x = 222,622.14/680.56
  6. Step 6: Final answer
    x = 327.12

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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.