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Finding the Fourth Proportional to 323.55, 485.42 and 141.09

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Solution

The fourth proportional to 323.55, 485.42 and 141.09 is: 211.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.55 : 485.42 = 141.09 : x
  2. Step 2: Convert to fraction form
    323.55/485.42 = 141.09/x
  3. Step 3: Cross multiply
    323.55x = 485.42 × 141.09
  4. Step 4: Simplify right side
    323.55x = 68,487.20
  5. Step 5: Solve for x
    x = 68,487.20/323.55
  6. Step 6: Final answer
    x = 211.67

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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.