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Finding the Fourth Proportional to 352.72, 486.83 and 221.90

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Solution

The fourth proportional to 352.72, 486.83 and 221.90 is: 306.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.72 : 486.83 = 221.90 : x
  2. Step 2: Convert to fraction form
    352.72/486.83 = 221.90/x
  3. Step 3: Cross multiply
    352.72x = 486.83 × 221.90
  4. Step 4: Simplify right side
    352.72x = 108,026.47
  5. Step 5: Solve for x
    x = 108,026.47/352.72
  6. Step 6: Final answer
    x = 306.27

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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.