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Finding the Fourth Proportional to 680.57, 1,020.84 and 218.38

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Solution

The fourth proportional to 680.57, 1,020.84 and 218.38 is: 327.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.57 : 1,020.84 = 218.38 : x
  2. Step 2: Convert to fraction form
    680.57/1,020.84 = 218.38/x
  3. Step 3: Cross multiply
    680.57x = 1,020.84 × 218.38
  4. Step 4: Simplify right side
    680.57x = 222,931.04
  5. Step 5: Solve for x
    x = 222,931.04/680.57
  6. Step 6: Final answer
    x = 327.57

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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.