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Finding the Fourth Proportional to 352.29, 485.97 and 221.25

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Solution

The fourth proportional to 352.29, 485.97 and 221.25 is: 305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.29 : 485.97 = 221.25 : x
  2. Step 2: Convert to fraction form
    352.29/485.97 = 221.25/x
  3. Step 3: Cross multiply
    352.29x = 485.97 × 221.25
  4. Step 4: Simplify right side
    352.29x = 107,520.86
  5. Step 5: Solve for x
    x = 107,520.86/352.29
  6. Step 6: Final answer
    x = 305.21

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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.