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Finding the Fourth Proportional to 79.44, 119.19 and 78.36

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Solution

The fourth proportional to 79.44, 119.19 and 78.36 is: 117.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.44 : 119.19 = 78.36 : x
  2. Step 2: Convert to fraction form
    79.44/119.19 = 78.36/x
  3. Step 3: Cross multiply
    79.44x = 119.19 × 78.36
  4. Step 4: Simplify right side
    79.44x = 9,339.73
  5. Step 5: Solve for x
    x = 9,339.73/79.44
  6. Step 6: Final answer
    x = 117.57

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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.