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Finding the Fourth Proportional to 414.65, 621.86 and 122.15

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Solution

The fourth proportional to 414.65, 621.86 and 122.15 is: 183.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.65 : 621.86 = 122.15 : x
  2. Step 2: Convert to fraction form
    414.65/621.86 = 122.15/x
  3. Step 3: Cross multiply
    414.65x = 621.86 × 122.15
  4. Step 4: Simplify right side
    414.65x = 75,956.48
  5. Step 5: Solve for x
    x = 75,956.48/414.65
  6. Step 6: Final answer
    x = 183.18

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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.