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Finding the Fourth Proportional to 414.86, 621.95 and 219.85

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Solution

The fourth proportional to 414.86, 621.95 and 219.85 is: 329.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.86 : 621.95 = 219.85 : x
  2. Step 2: Convert to fraction form
    414.86/621.95 = 219.85/x
  3. Step 3: Cross multiply
    414.86x = 621.95 × 219.85
  4. Step 4: Simplify right side
    414.86x = 136,733.05
  5. Step 5: Solve for x
    x = 136,733.05/414.86
  6. Step 6: Final answer
    x = 329.59

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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.