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Finding the Fourth Proportional to 112.05, 168.12 and 91.80

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Solution

The fourth proportional to 112.05, 168.12 and 91.80 is: 137.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.05 : 168.12 = 91.80 : x
  2. Step 2: Convert to fraction form
    112.05/168.12 = 91.80/x
  3. Step 3: Cross multiply
    112.05x = 168.12 × 91.80
  4. Step 4: Simplify right side
    112.05x = 15,433.42
  5. Step 5: Solve for x
    x = 15,433.42/112.05
  6. Step 6: Final answer
    x = 137.74

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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.