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Finding the Fourth Proportional to 112.69, 168.87 and 83.76

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Solution

The fourth proportional to 112.69, 168.87 and 83.76 is: 125.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.69 : 168.87 = 83.76 : x
  2. Step 2: Convert to fraction form
    112.69/168.87 = 83.76/x
  3. Step 3: Cross multiply
    112.69x = 168.87 × 83.76
  4. Step 4: Simplify right side
    112.69x = 14,144.13
  5. Step 5: Solve for x
    x = 14,144.13/112.69
  6. Step 6: Final answer
    x = 125.51

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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.