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Finding the Fourth Proportional to 120.99, 168.08 and 119.55

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Solution

The fourth proportional to 120.99, 168.08 and 119.55 is: 166.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.99 : 168.08 = 119.55 : x
  2. Step 2: Convert to fraction form
    120.99/168.08 = 119.55/x
  3. Step 3: Cross multiply
    120.99x = 168.08 × 119.55
  4. Step 4: Simplify right side
    120.99x = 20,093.12
  5. Step 5: Solve for x
    x = 20,093.12/120.99
  6. Step 6: Final answer
    x = 166.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.