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Finding the Fourth Proportional to 323.80, 485.70 and 161.80

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Solution

The fourth proportional to 323.80, 485.70 and 161.80 is: 242.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.80 : 485.70 = 161.80 : x
  2. Step 2: Convert to fraction form
    323.80/485.70 = 161.80/x
  3. Step 3: Cross multiply
    323.80x = 485.70 × 161.80
  4. Step 4: Simplify right side
    323.80x = 78,586.26
  5. Step 5: Solve for x
    x = 78,586.26/323.80
  6. Step 6: Final answer
    x = 242.70

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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.