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Finding the Fourth Proportional to 352.14, 485.89 and 221.19

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Solution

The fourth proportional to 352.14, 485.89 and 221.19 is: 305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.14 : 485.89 = 221.19 : x
  2. Step 2: Convert to fraction form
    352.14/485.89 = 221.19/x
  3. Step 3: Cross multiply
    352.14x = 485.89 × 221.19
  4. Step 4: Simplify right side
    352.14x = 107,474.01
  5. Step 5: Solve for x
    x = 107,474.01/352.14
  6. Step 6: Final answer
    x = 305.20

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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.