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Finding the Fourth Proportional to 351.97, 485.76 and 221.15

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Solution

The fourth proportional to 351.97, 485.76 and 221.15 is: 305.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.97 : 485.76 = 221.15 : x
  2. Step 2: Convert to fraction form
    351.97/485.76 = 221.15/x
  3. Step 3: Cross multiply
    351.97x = 485.76 × 221.15
  4. Step 4: Simplify right side
    351.97x = 107,427.87
  5. Step 5: Solve for x
    x = 107,427.87/351.97
  6. Step 6: Final answer
    x = 305.22

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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.