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Finding the Fourth Proportional to 457.25, 685.90 and 252.21

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Solution

The fourth proportional to 457.25, 685.90 and 252.21 is: 378.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.25 : 685.90 = 252.21 : x
  2. Step 2: Convert to fraction form
    457.25/685.90 = 252.21/x
  3. Step 3: Cross multiply
    457.25x = 685.90 × 252.21
  4. Step 4: Simplify right side
    457.25x = 172,993.73
  5. Step 5: Solve for x
    x = 172,993.73/457.25
  6. Step 6: Final answer
    x = 378.34

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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.