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Finding the Fourth Proportional to 221.72, 305.86 and 206.09

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Solution

The fourth proportional to 221.72, 305.86 and 206.09 is: 284.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.72 : 305.86 = 206.09 : x
  2. Step 2: Convert to fraction form
    221.72/305.86 = 206.09/x
  3. Step 3: Cross multiply
    221.72x = 305.86 × 206.09
  4. Step 4: Simplify right side
    221.72x = 63,034.69
  5. Step 5: Solve for x
    x = 63,034.69/221.72
  6. Step 6: Final answer
    x = 284.30

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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.