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Finding the Fourth Proportional to 412.09, 618.21 and 130.73

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Solution

The fourth proportional to 412.09, 618.21 and 130.73 is: 196.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.09 : 618.21 = 130.73 : x
  2. Step 2: Convert to fraction form
    412.09/618.21 = 130.73/x
  3. Step 3: Cross multiply
    412.09x = 618.21 × 130.73
  4. Step 4: Simplify right side
    412.09x = 80,817.37
  5. Step 5: Solve for x
    x = 80,817.37/412.09
  6. Step 6: Final answer
    x = 196.11

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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.