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Finding the Fourth Proportional to 323.75, 485.61 and 107.31

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Solution

The fourth proportional to 323.75, 485.61 and 107.31 is: 160.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.75 : 485.61 = 107.31 : x
  2. Step 2: Convert to fraction form
    323.75/485.61 = 107.31/x
  3. Step 3: Cross multiply
    323.75x = 485.61 × 107.31
  4. Step 4: Simplify right side
    323.75x = 52,110.81
  5. Step 5: Solve for x
    x = 52,110.81/323.75
  6. Step 6: Final answer
    x = 160.96

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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.