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Finding the Fourth Proportional to 323.26, 485.20 and 140.71

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Solution

The fourth proportional to 323.26, 485.20 and 140.71 is: 211.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.26 : 485.20 = 140.71 : x
  2. Step 2: Convert to fraction form
    323.26/485.20 = 140.71/x
  3. Step 3: Cross multiply
    323.26x = 485.20 × 140.71
  4. Step 4: Simplify right side
    323.26x = 68,272.49
  5. Step 5: Solve for x
    x = 68,272.49/323.26
  6. Step 6: Final answer
    x = 211.20

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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.