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Finding the Fourth Proportional to 414.49, 621.63 and 121.91

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Solution

The fourth proportional to 414.49, 621.63 and 121.91 is: 182.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.49 : 621.63 = 121.91 : x
  2. Step 2: Convert to fraction form
    414.49/621.63 = 121.91/x
  3. Step 3: Cross multiply
    414.49x = 621.63 × 121.91
  4. Step 4: Simplify right side
    414.49x = 75,782.91
  5. Step 5: Solve for x
    x = 75,782.91/414.49
  6. Step 6: Final answer
    x = 182.83

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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.