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Finding the Fourth Proportional to 680.55, 1,020.90 and 218.22

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Solution

The fourth proportional to 680.55, 1,020.90 and 218.22 is: 327.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.55 : 1,020.90 = 218.22 : x
  2. Step 2: Convert to fraction form
    680.55/1,020.90 = 218.22/x
  3. Step 3: Cross multiply
    680.55x = 1,020.90 × 218.22
  4. Step 4: Simplify right side
    680.55x = 222,780.80
  5. Step 5: Solve for x
    x = 222,780.80/680.55
  6. Step 6: Final answer
    x = 327.35

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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.