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Finding the Fourth Proportional to 121.26, 166.62 and 107.43

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Solution

The fourth proportional to 121.26, 166.62 and 107.43 is: 147.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.26 : 166.62 = 107.43 : x
  2. Step 2: Convert to fraction form
    121.26/166.62 = 107.43/x
  3. Step 3: Cross multiply
    121.26x = 166.62 × 107.43
  4. Step 4: Simplify right side
    121.26x = 17,899.76
  5. Step 5: Solve for x
    x = 17,899.76/121.26
  6. Step 6: Final answer
    x = 147.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.