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Finding the Fourth Proportional to 119.62, 179.11 and 78.54

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Solution

The fourth proportional to 119.62, 179.11 and 78.54 is: 117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.62 : 179.11 = 78.54 : x
  2. Step 2: Convert to fraction form
    119.62/179.11 = 78.54/x
  3. Step 3: Cross multiply
    119.62x = 179.11 × 78.54
  4. Step 4: Simplify right side
    119.62x = 14,067.30
  5. Step 5: Solve for x
    x = 14,067.30/119.62
  6. Step 6: Final answer
    x = 117.60

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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.