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Finding the Fourth Proportional to 412.17, 618.39 and 219.75

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Solution

The fourth proportional to 412.17, 618.39 and 219.75 is: 329.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.17 : 618.39 = 219.75 : x
  2. Step 2: Convert to fraction form
    412.17/618.39 = 219.75/x
  3. Step 3: Cross multiply
    412.17x = 618.39 × 219.75
  4. Step 4: Simplify right side
    412.17x = 135,891.20
  5. Step 5: Solve for x
    x = 135,891.20/412.17
  6. Step 6: Final answer
    x = 329.70

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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.