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Finding the Fourth Proportional to 414.20, 621.66 and 170.90

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Solution

The fourth proportional to 414.20, 621.66 and 170.90 is: 256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.20 : 621.66 = 170.90 : x
  2. Step 2: Convert to fraction form
    414.20/621.66 = 170.90/x
  3. Step 3: Cross multiply
    414.20x = 621.66 × 170.90
  4. Step 4: Simplify right side
    414.20x = 106,241.69
  5. Step 5: Solve for x
    x = 106,241.69/414.20
  6. Step 6: Final answer
    x = 256.50

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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.