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Finding the Fourth Proportional to 225.53, 310.81 and 221.54

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Solution

The fourth proportional to 225.53, 310.81 and 221.54 is: 305.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.53 : 310.81 = 221.54 : x
  2. Step 2: Convert to fraction form
    225.53/310.81 = 221.54/x
  3. Step 3: Cross multiply
    225.53x = 310.81 × 221.54
  4. Step 4: Simplify right side
    225.53x = 68,856.85
  5. Step 5: Solve for x
    x = 68,856.85/225.53
  6. Step 6: Final answer
    x = 305.31

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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.