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Finding the Fourth Proportional to 112.15, 168.23 and 73.88

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Solution

The fourth proportional to 112.15, 168.23 and 73.88 is: 110.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.15 : 168.23 = 73.88 : x
  2. Step 2: Convert to fraction form
    112.15/168.23 = 73.88/x
  3. Step 3: Cross multiply
    112.15x = 168.23 × 73.88
  4. Step 4: Simplify right side
    112.15x = 12,427.62
  5. Step 5: Solve for x
    x = 12,427.62/112.15
  6. Step 6: Final answer
    x = 110.81

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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.