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Finding the Fourth Proportional to 120.05, 179.61 and 91.25

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Solution

The fourth proportional to 120.05, 179.61 and 91.25 is: 136.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.05 : 179.61 = 91.25 : x
  2. Step 2: Convert to fraction form
    120.05/179.61 = 91.25/x
  3. Step 3: Cross multiply
    120.05x = 179.61 × 91.25
  4. Step 4: Simplify right side
    120.05x = 16,388.06
  5. Step 5: Solve for x
    x = 16,388.06/120.05
  6. Step 6: Final answer
    x = 136.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.