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Finding the Fourth Proportional to 112.12, 154.17 and 108.70

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Solution

The fourth proportional to 112.12, 154.17 and 108.70 is: 149.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.12 : 154.17 = 108.70 : x
  2. Step 2: Convert to fraction form
    112.12/154.17 = 108.70/x
  3. Step 3: Cross multiply
    112.12x = 154.17 × 108.70
  4. Step 4: Simplify right side
    112.12x = 16,757.89
  5. Step 5: Solve for x
    x = 16,757.89/112.12
  6. Step 6: Final answer
    x = 149.47

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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.