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Finding the Fourth Proportional to 457.28, 685.30 and 251.54

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Solution

The fourth proportional to 457.28, 685.30 and 251.54 is: 376.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.28 : 685.30 = 251.54 : x
  2. Step 2: Convert to fraction form
    457.28/685.30 = 251.54/x
  3. Step 3: Cross multiply
    457.28x = 685.30 × 251.54
  4. Step 4: Simplify right side
    457.28x = 172,380.36
  5. Step 5: Solve for x
    x = 172,380.36/457.28
  6. Step 6: Final answer
    x = 376.97

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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.