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Finding the Fourth Proportional to 143.37, 196.83 and 138.78

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Solution

The fourth proportional to 143.37, 196.83 and 138.78 is: 190.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.37 : 196.83 = 138.78 : x
  2. Step 2: Convert to fraction form
    143.37/196.83 = 138.78/x
  3. Step 3: Cross multiply
    143.37x = 196.83 × 138.78
  4. Step 4: Simplify right side
    143.37x = 27,316.07
  5. Step 5: Solve for x
    x = 27,316.07/143.37
  6. Step 6: Final answer
    x = 190.53

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.