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Finding the Fourth Proportional to 112.91, 169.35 and 31.74

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Solution

The fourth proportional to 112.91, 169.35 and 31.74 is: 47.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.91 : 169.35 = 31.74 : x
  2. Step 2: Convert to fraction form
    112.91/169.35 = 31.74/x
  3. Step 3: Cross multiply
    112.91x = 169.35 × 31.74
  4. Step 4: Simplify right side
    112.91x = 5,375.17
  5. Step 5: Solve for x
    x = 5,375.17/112.91
  6. Step 6: Final answer
    x = 47.61

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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.