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Finding the Fourth Proportional to 120.45, 179.64 and 119.09

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Solution

The fourth proportional to 120.45, 179.64 and 119.09 is: 177.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.45 : 179.64 = 119.09 : x
  2. Step 2: Convert to fraction form
    120.45/179.64 = 119.09/x
  3. Step 3: Cross multiply
    120.45x = 179.64 × 119.09
  4. Step 4: Simplify right side
    120.45x = 21,392.43
  5. Step 5: Solve for x
    x = 21,392.43/120.45
  6. Step 6: Final answer
    x = 177.60

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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.