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Finding the Fourth Proportional to 408.43, 612.72 and 134.53

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Solution

The fourth proportional to 408.43, 612.72 and 134.53 is: 201.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.43 : 612.72 = 134.53 : x
  2. Step 2: Convert to fraction form
    408.43/612.72 = 134.53/x
  3. Step 3: Cross multiply
    408.43x = 612.72 × 134.53
  4. Step 4: Simplify right side
    408.43x = 82,429.22
  5. Step 5: Solve for x
    x = 82,429.22/408.43
  6. Step 6: Final answer
    x = 201.82

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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.