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Finding the Fourth Proportional to 236.80, 326.82 and 138.58

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Solution

The fourth proportional to 236.80, 326.82 and 138.58 is: 191.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.80 : 326.82 = 138.58 : x
  2. Step 2: Convert to fraction form
    236.80/326.82 = 138.58/x
  3. Step 3: Cross multiply
    236.80x = 326.82 × 138.58
  4. Step 4: Simplify right side
    236.80x = 45,290.72
  5. Step 5: Solve for x
    x = 45,290.72/236.80
  6. Step 6: Final answer
    x = 191.26

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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.