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Finding the Fourth Proportional to 352.05, 485.90 and 221.37

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Solution

The fourth proportional to 352.05, 485.90 and 221.37 is: 305.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.05 : 485.90 = 221.37 : x
  2. Step 2: Convert to fraction form
    352.05/485.90 = 221.37/x
  3. Step 3: Cross multiply
    352.05x = 485.90 × 221.37
  4. Step 4: Simplify right side
    352.05x = 107,563.68
  5. Step 5: Solve for x
    x = 107,563.68/352.05
  6. Step 6: Final answer
    x = 305.54

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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.