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Finding the Fourth Proportional to 112.16, 168.44 and 91.91

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Solution

The fourth proportional to 112.16, 168.44 and 91.91 is: 138.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.16 : 168.44 = 91.91 : x
  2. Step 2: Convert to fraction form
    112.16/168.44 = 91.91/x
  3. Step 3: Cross multiply
    112.16x = 168.44 × 91.91
  4. Step 4: Simplify right side
    112.16x = 15,481.32
  5. Step 5: Solve for x
    x = 15,481.32/112.16
  6. Step 6: Final answer
    x = 138.03

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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.