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Finding the Fourth Proportional to 323.58, 485.68 and 251.90

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Solution

The fourth proportional to 323.58, 485.68 and 251.90 is: 378.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.58 : 485.68 = 251.90 : x
  2. Step 2: Convert to fraction form
    323.58/485.68 = 251.90/x
  3. Step 3: Cross multiply
    323.58x = 485.68 × 251.90
  4. Step 4: Simplify right side
    323.58x = 122,342.79
  5. Step 5: Solve for x
    x = 122,342.79/323.58
  6. Step 6: Final answer
    x = 378.09

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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.