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Finding the Fourth Proportional to 227.11, 312.51 and 221.71

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Solution

The fourth proportional to 227.11, 312.51 and 221.71 is: 305.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.11 : 312.51 = 221.71 : x
  2. Step 2: Convert to fraction form
    227.11/312.51 = 221.71/x
  3. Step 3: Cross multiply
    227.11x = 312.51 × 221.71
  4. Step 4: Simplify right side
    227.11x = 69,286.59
  5. Step 5: Solve for x
    x = 69,286.59/227.11
  6. Step 6: Final answer
    x = 305.08

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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.