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Finding the Fourth Proportional to 414.13, 621.09 and 121.70

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Solution

The fourth proportional to 414.13, 621.09 and 121.70 is: 182.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.13 : 621.09 = 121.70 : x
  2. Step 2: Convert to fraction form
    414.13/621.09 = 121.70/x
  3. Step 3: Cross multiply
    414.13x = 621.09 × 121.70
  4. Step 4: Simplify right side
    414.13x = 75,582.94
  5. Step 5: Solve for x
    x = 75,582.94/414.13
  6. Step 6: Final answer
    x = 182.51

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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.