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Finding the Fourth Proportional to 111.91, 154.46 and 104.96

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Solution

The fourth proportional to 111.91, 154.46 and 104.96 is: 144.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.91 : 154.46 = 104.96 : x
  2. Step 2: Convert to fraction form
    111.91/154.46 = 104.96/x
  3. Step 3: Cross multiply
    111.91x = 154.46 × 104.96
  4. Step 4: Simplify right side
    111.91x = 16,212.51
  5. Step 5: Solve for x
    x = 16,212.51/111.91
  6. Step 6: Final answer
    x = 144.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.