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Finding the Fourth Proportional to 323.57, 485.39 and 107.15

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Solution

The fourth proportional to 323.57, 485.39 and 107.15 is: 160.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.57 : 485.39 = 107.15 : x
  2. Step 2: Convert to fraction form
    323.57/485.39 = 107.15/x
  3. Step 3: Cross multiply
    323.57x = 485.39 × 107.15
  4. Step 4: Simplify right side
    323.57x = 52,009.54
  5. Step 5: Solve for x
    x = 52,009.54/323.57
  6. Step 6: Final answer
    x = 160.74

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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.