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Finding the Fourth Proportional to 225.36, 338.40 and 129.60

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Solution

The fourth proportional to 225.36, 338.40 and 129.60 is: 194.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.36 : 338.40 = 129.60 : x
  2. Step 2: Convert to fraction form
    225.36/338.40 = 129.60/x
  3. Step 3: Cross multiply
    225.36x = 338.40 × 129.60
  4. Step 4: Simplify right side
    225.36x = 43,856.64
  5. Step 5: Solve for x
    x = 43,856.64/225.36
  6. Step 6: Final answer
    x = 194.61

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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.