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Finding the Fourth Proportional to 414.19, 621.39 and 121.68

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Solution

The fourth proportional to 414.19, 621.39 and 121.68 is: 182.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.19 : 621.39 = 121.68 : x
  2. Step 2: Convert to fraction form
    414.19/621.39 = 121.68/x
  3. Step 3: Cross multiply
    414.19x = 621.39 × 121.68
  4. Step 4: Simplify right side
    414.19x = 75,610.74
  5. Step 5: Solve for x
    x = 75,610.74/414.19
  6. Step 6: Final answer
    x = 182.55

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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.