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Finding the Fourth Proportional to 225.69, 338.42 and 79.43

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Solution

The fourth proportional to 225.69, 338.42 and 79.43 is: 119.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.69 : 338.42 = 79.43 : x
  2. Step 2: Convert to fraction form
    225.69/338.42 = 79.43/x
  3. Step 3: Cross multiply
    225.69x = 338.42 × 79.43
  4. Step 4: Simplify right side
    225.69x = 26,879.21
  5. Step 5: Solve for x
    x = 26,879.21/225.69
  6. Step 6: Final answer
    x = 119.10

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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.