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Finding the Fourth Proportional to 323.60, 485.48 and 140.90

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Solution

The fourth proportional to 323.60, 485.48 and 140.90 is: 211.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.60 : 485.48 = 140.90 : x
  2. Step 2: Convert to fraction form
    323.60/485.48 = 140.90/x
  3. Step 3: Cross multiply
    323.60x = 485.48 × 140.90
  4. Step 4: Simplify right side
    323.60x = 68,404.13
  5. Step 5: Solve for x
    x = 68,404.13/323.60
  6. Step 6: Final answer
    x = 211.38

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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.