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Finding the Fourth Proportional to 326.44, 450.34 and 221.40

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Solution

The fourth proportional to 326.44, 450.34 and 221.40 is: 305.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.44 : 450.34 = 221.40 : x
  2. Step 2: Convert to fraction form
    326.44/450.34 = 221.40/x
  3. Step 3: Cross multiply
    326.44x = 450.34 × 221.40
  4. Step 4: Simplify right side
    326.44x = 99,705.28
  5. Step 5: Solve for x
    x = 99,705.28/326.44
  6. Step 6: Final answer
    x = 305.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.