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Finding the Fourth Proportional to 457.22, 685.31 and 251.89

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Solution

The fourth proportional to 457.22, 685.31 and 251.89 is: 377.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.22 : 685.31 = 251.89 : x
  2. Step 2: Convert to fraction form
    457.22/685.31 = 251.89/x
  3. Step 3: Cross multiply
    457.22x = 685.31 × 251.89
  4. Step 4: Simplify right side
    457.22x = 172,622.74
  5. Step 5: Solve for x
    x = 172,622.74/457.22
  6. Step 6: Final answer
    x = 377.55

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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.