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Finding the Fourth Proportional to 414.78, 621.70 and 171.09

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Solution

The fourth proportional to 414.78, 621.70 and 171.09 is: 256.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.78 : 621.70 = 171.09 : x
  2. Step 2: Convert to fraction form
    414.78/621.70 = 171.09/x
  3. Step 3: Cross multiply
    414.78x = 621.70 × 171.09
  4. Step 4: Simplify right side
    414.78x = 106,366.65
  5. Step 5: Solve for x
    x = 106,366.65/414.78
  6. Step 6: Final answer
    x = 256.44

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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.