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Finding the Fourth Proportional to 414.06, 621.28 and 170.78

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Solution

The fourth proportional to 414.06, 621.28 and 170.78 is: 256.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.06 : 621.28 = 170.78 : x
  2. Step 2: Convert to fraction form
    414.06/621.28 = 170.78/x
  3. Step 3: Cross multiply
    414.06x = 621.28 × 170.78
  4. Step 4: Simplify right side
    414.06x = 106,102.20
  5. Step 5: Solve for x
    x = 106,102.20/414.06
  6. Step 6: Final answer
    x = 256.25

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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.