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Finding the Fourth Proportional to 225.24, 338.31 and 218.86

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Solution

The fourth proportional to 225.24, 338.31 and 218.86 is: 328.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.24 : 338.31 = 218.86 : x
  2. Step 2: Convert to fraction form
    225.24/338.31 = 218.86/x
  3. Step 3: Cross multiply
    225.24x = 338.31 × 218.86
  4. Step 4: Simplify right side
    225.24x = 74,041.68
  5. Step 5: Solve for x
    x = 74,041.68/225.24
  6. Step 6: Final answer
    x = 328.73

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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.