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Finding the Fourth Proportional to 408.93, 613.20 and 131.21

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Solution

The fourth proportional to 408.93, 613.20 and 131.21 is: 196.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.93 : 613.20 = 131.21 : x
  2. Step 2: Convert to fraction form
    408.93/613.20 = 131.21/x
  3. Step 3: Cross multiply
    408.93x = 613.20 × 131.21
  4. Step 4: Simplify right side
    408.93x = 80,457.97
  5. Step 5: Solve for x
    x = 80,457.97/408.93
  6. Step 6: Final answer
    x = 196.75

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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.