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Finding the Fourth Proportional to 112.35, 168.66 and 71.85

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Solution

The fourth proportional to 112.35, 168.66 and 71.85 is: 107.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.35 : 168.66 = 71.85 : x
  2. Step 2: Convert to fraction form
    112.35/168.66 = 71.85/x
  3. Step 3: Cross multiply
    112.35x = 168.66 × 71.85
  4. Step 4: Simplify right side
    112.35x = 12,118.22
  5. Step 5: Solve for x
    x = 12,118.22/112.35
  6. Step 6: Final answer
    x = 107.86

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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.