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Finding the Fourth Proportional to 236.31, 354.83 and 221.28

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Solution

The fourth proportional to 236.31, 354.83 and 221.28 is: 332.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.31 : 354.83 = 221.28 : x
  2. Step 2: Convert to fraction form
    236.31/354.83 = 221.28/x
  3. Step 3: Cross multiply
    236.31x = 354.83 × 221.28
  4. Step 4: Simplify right side
    236.31x = 78,515.68
  5. Step 5: Solve for x
    x = 78,515.68/236.31
  6. Step 6: Final answer
    x = 332.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.