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Finding the Fourth Proportional to 323.89, 485.33 and 311.90

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Solution

The fourth proportional to 323.89, 485.33 and 311.90 is: 467.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.89 : 485.33 = 311.90 : x
  2. Step 2: Convert to fraction form
    323.89/485.33 = 311.90/x
  3. Step 3: Cross multiply
    323.89x = 485.33 × 311.90
  4. Step 4: Simplify right side
    323.89x = 151,370.44
  5. Step 5: Solve for x
    x = 151,370.44/323.89
  6. Step 6: Final answer
    x = 467.35

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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.