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Finding the Fourth Proportional to 236.48, 327.12 and 221

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Solution

The fourth proportional to 236.48, 327.12 and 221 is: 305.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.48 : 327.12 = 221 : x
  2. Step 2: Convert to fraction form
    236.48/327.12 = 221/x
  3. Step 3: Cross multiply
    236.48x = 327.12 × 221
  4. Step 4: Simplify right side
    236.48x = 72,293.52
  5. Step 5: Solve for x
    x = 72,293.52/236.48
  6. Step 6: Final answer
    x = 305.71

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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.