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Finding the Fourth Proportional to 112.24, 168.09 and 83.28

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Solution

The fourth proportional to 112.24, 168.09 and 83.28 is: 124.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.24 : 168.09 = 83.28 : x
  2. Step 2: Convert to fraction form
    112.24/168.09 = 83.28/x
  3. Step 3: Cross multiply
    112.24x = 168.09 × 83.28
  4. Step 4: Simplify right side
    112.24x = 13,998.54
  5. Step 5: Solve for x
    x = 13,998.54/112.24
  6. Step 6: Final answer
    x = 124.72

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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.