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Finding the Fourth Proportional to 236.81, 326.81 and 138.53

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Solution

The fourth proportional to 236.81, 326.81 and 138.53 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.81 : 326.81 = 138.53 : x
  2. Step 2: Convert to fraction form
    236.81/326.81 = 138.53/x
  3. Step 3: Cross multiply
    236.81x = 326.81 × 138.53
  4. Step 4: Simplify right side
    236.81x = 45,272.99
  5. Step 5: Solve for x
    x = 45,272.99/236.81
  6. Step 6: Final answer
    x = 191.18

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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.