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Finding the Fourth Proportional to 414.21, 621.31 and 170.56

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Solution

The fourth proportional to 414.21, 621.31 and 170.56 is: 255.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.21 : 621.31 = 170.56 : x
  2. Step 2: Convert to fraction form
    414.21/621.31 = 170.56/x
  3. Step 3: Cross multiply
    414.21x = 621.31 × 170.56
  4. Step 4: Simplify right side
    414.21x = 105,970.63
  5. Step 5: Solve for x
    x = 105,970.63/414.21
  6. Step 6: Final answer
    x = 255.84

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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.