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Finding the Fourth Proportional to 414.47, 621.71 and 121.91

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Solution

The fourth proportional to 414.47, 621.71 and 121.91 is: 182.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.47 : 621.71 = 121.91 : x
  2. Step 2: Convert to fraction form
    414.47/621.71 = 121.91/x
  3. Step 3: Cross multiply
    414.47x = 621.71 × 121.91
  4. Step 4: Simplify right side
    414.47x = 75,794.53
  5. Step 5: Solve for x
    x = 75,794.53/414.47
  6. Step 6: Final answer
    x = 182.87

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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.