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Finding the Fourth Proportional to 112.18, 167.86 and 76

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Solution

The fourth proportional to 112.18, 167.86 and 76 is: 113.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.18 : 167.86 = 76 : x
  2. Step 2: Convert to fraction form
    112.18/167.86 = 76/x
  3. Step 3: Cross multiply
    112.18x = 167.86 × 76
  4. Step 4: Simplify right side
    112.18x = 12,757.36
  5. Step 5: Solve for x
    x = 12,757.36/112.18
  6. Step 6: Final answer
    x = 113.72

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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.