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Finding the Fourth Proportional to 412.82, 618.90 and 217.82

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Solution

The fourth proportional to 412.82, 618.90 and 217.82 is: 326.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.82 : 618.90 = 217.82 : x
  2. Step 2: Convert to fraction form
    412.82/618.90 = 217.82/x
  3. Step 3: Cross multiply
    412.82x = 618.90 × 217.82
  4. Step 4: Simplify right side
    412.82x = 134,808.80
  5. Step 5: Solve for x
    x = 134,808.80/412.82
  6. Step 6: Final answer
    x = 326.56

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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.