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Finding the Fourth Proportional to 112.37, 168.39 and 66.69

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Solution

The fourth proportional to 112.37, 168.39 and 66.69 is: 99.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.37 : 168.39 = 66.69 : x
  2. Step 2: Convert to fraction form
    112.37/168.39 = 66.69/x
  3. Step 3: Cross multiply
    112.37x = 168.39 × 66.69
  4. Step 4: Simplify right side
    112.37x = 11,229.93
  5. Step 5: Solve for x
    x = 11,229.93/112.37
  6. Step 6: Final answer
    x = 99.94

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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.