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Finding the Fourth Proportional to 323.80, 485.34 and 131.40

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Solution

The fourth proportional to 323.80, 485.34 and 131.40 is: 196.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.80 : 485.34 = 131.40 : x
  2. Step 2: Convert to fraction form
    323.80/485.34 = 131.40/x
  3. Step 3: Cross multiply
    323.80x = 485.34 × 131.40
  4. Step 4: Simplify right side
    323.80x = 63,773.68
  5. Step 5: Solve for x
    x = 63,773.68/323.80
  6. Step 6: Final answer
    x = 196.95

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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.