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Finding the Fourth Proportional to 236.78, 326.72 and 137.18

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Solution

The fourth proportional to 236.78, 326.72 and 137.18 is: 189.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.78 : 326.72 = 137.18 : x
  2. Step 2: Convert to fraction form
    236.78/326.72 = 137.18/x
  3. Step 3: Cross multiply
    236.78x = 326.72 × 137.18
  4. Step 4: Simplify right side
    236.78x = 44,819.45
  5. Step 5: Solve for x
    x = 44,819.45/236.78
  6. Step 6: Final answer
    x = 189.29

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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.