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Finding the Fourth Proportional to 120.84, 166.07 and 108.69

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Solution

The fourth proportional to 120.84, 166.07 and 108.69 is: 149.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 166.07 = 108.69 : x
  2. Step 2: Convert to fraction form
    120.84/166.07 = 108.69/x
  3. Step 3: Cross multiply
    120.84x = 166.07 × 108.69
  4. Step 4: Simplify right side
    120.84x = 18,050.15
  5. Step 5: Solve for x
    x = 18,050.15/120.84
  6. Step 6: Final answer
    x = 149.37

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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.