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Finding the Fourth Proportional to 112.74, 168.24 and 109.29

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Solution

The fourth proportional to 112.74, 168.24 and 109.29 is: 163.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.74 : 168.24 = 109.29 : x
  2. Step 2: Convert to fraction form
    112.74/168.24 = 109.29/x
  3. Step 3: Cross multiply
    112.74x = 168.24 × 109.29
  4. Step 4: Simplify right side
    112.74x = 18,386.95
  5. Step 5: Solve for x
    x = 18,386.95/112.74
  6. Step 6: Final answer
    x = 163.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.