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Finding the Fourth Proportional to 236.57, 326.45 and 138.31

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Solution

The fourth proportional to 236.57, 326.45 and 138.31 is: 190.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.57 : 326.45 = 138.31 : x
  2. Step 2: Convert to fraction form
    236.57/326.45 = 138.31/x
  3. Step 3: Cross multiply
    236.57x = 326.45 × 138.31
  4. Step 4: Simplify right side
    236.57x = 45,149.79
  5. Step 5: Solve for x
    x = 45,149.79/236.57
  6. Step 6: Final answer
    x = 190.85

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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.