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Finding the Fourth Proportional to 112.09, 168.39 and 79.80

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Solution

The fourth proportional to 112.09, 168.39 and 79.80 is: 119.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.09 : 168.39 = 79.80 : x
  2. Step 2: Convert to fraction form
    112.09/168.39 = 79.80/x
  3. Step 3: Cross multiply
    112.09x = 168.39 × 79.80
  4. Step 4: Simplify right side
    112.09x = 13,437.52
  5. Step 5: Solve for x
    x = 13,437.52/112.09
  6. Step 6: Final answer
    x = 119.88

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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.