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Finding the Fourth Proportional to 236.30, 326.15 and 138.09

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Solution

The fourth proportional to 236.30, 326.15 and 138.09 is: 190.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.30 : 326.15 = 138.09 : x
  2. Step 2: Convert to fraction form
    236.30/326.15 = 138.09/x
  3. Step 3: Cross multiply
    236.30x = 326.15 × 138.09
  4. Step 4: Simplify right side
    236.30x = 45,037.36
  5. Step 5: Solve for x
    x = 45,037.36/236.30
  6. Step 6: Final answer
    x = 190.60

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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.