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Finding the Fourth Proportional to 352.28, 486.15 and 221.29

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Solution

The fourth proportional to 352.28, 486.15 and 221.29 is: 305.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.28 : 486.15 = 221.29 : x
  2. Step 2: Convert to fraction form
    352.28/486.15 = 221.29/x
  3. Step 3: Cross multiply
    352.28x = 486.15 × 221.29
  4. Step 4: Simplify right side
    352.28x = 107,578.92
  5. Step 5: Solve for x
    x = 107,578.92/352.28
  6. Step 6: Final answer
    x = 305.38

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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.