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Finding the Fourth Proportional to 221.36, 305.25 and 218.12

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Solution

The fourth proportional to 221.36, 305.25 and 218.12 is: 300.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.36 : 305.25 = 218.12 : x
  2. Step 2: Convert to fraction form
    221.36/305.25 = 218.12/x
  3. Step 3: Cross multiply
    221.36x = 305.25 × 218.12
  4. Step 4: Simplify right side
    221.36x = 66,581.13
  5. Step 5: Solve for x
    x = 66,581.13/221.36
  6. Step 6: Final answer
    x = 300.78

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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.