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Finding the Fourth Proportional to 236.78, 326.80 and 153.96

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Solution

The fourth proportional to 236.78, 326.80 and 153.96 is: 212.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.78 : 326.80 = 153.96 : x
  2. Step 2: Convert to fraction form
    236.78/326.80 = 153.96/x
  3. Step 3: Cross multiply
    236.78x = 326.80 × 153.96
  4. Step 4: Simplify right side
    236.78x = 50,313.09
  5. Step 5: Solve for x
    x = 50,313.09/236.78
  6. Step 6: Final answer
    x = 212.49

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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.