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Finding the Fourth Proportional to 408.63, 612.96 and 161.85

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Solution

The fourth proportional to 408.63, 612.96 and 161.85 is: 242.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.63 : 612.96 = 161.85 : x
  2. Step 2: Convert to fraction form
    408.63/612.96 = 161.85/x
  3. Step 3: Cross multiply
    408.63x = 612.96 × 161.85
  4. Step 4: Simplify right side
    408.63x = 99,207.58
  5. Step 5: Solve for x
    x = 99,207.58/408.63
  6. Step 6: Final answer
    x = 242.78

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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.