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Finding the Fourth Proportional to 412.56, 618.36 and 331.50

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Solution

The fourth proportional to 412.56, 618.36 and 331.50 is: 496.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.56 : 618.36 = 331.50 : x
  2. Step 2: Convert to fraction form
    412.56/618.36 = 331.50/x
  3. Step 3: Cross multiply
    412.56x = 618.36 × 331.50
  4. Step 4: Simplify right side
    412.56x = 204,986.34
  5. Step 5: Solve for x
    x = 204,986.34/412.56
  6. Step 6: Final answer
    x = 496.86

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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.