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Finding the Fourth Proportional to 408.32, 612.44 and 119.76

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Solution

The fourth proportional to 408.32, 612.44 and 119.76 is: 179.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.32 : 612.44 = 119.76 : x
  2. Step 2: Convert to fraction form
    408.32/612.44 = 119.76/x
  3. Step 3: Cross multiply
    408.32x = 612.44 × 119.76
  4. Step 4: Simplify right side
    408.32x = 73,342.15
  5. Step 5: Solve for x
    x = 73,342.15/408.32
  6. Step 6: Final answer
    x = 179.62

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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.