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Finding the Fourth Proportional to 215.80, 323.16 and 112.72

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Solution

The fourth proportional to 215.80, 323.16 and 112.72 is: 168.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.80 : 323.16 = 112.72 : x
  2. Step 2: Convert to fraction form
    215.80/323.16 = 112.72/x
  3. Step 3: Cross multiply
    215.80x = 323.16 × 112.72
  4. Step 4: Simplify right side
    215.80x = 36,426.60
  5. Step 5: Solve for x
    x = 36,426.60/215.80
  6. Step 6: Final answer
    x = 168.80

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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.