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Finding the Fourth Proportional to 138.20, 190.64 and 98.33

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Solution

The fourth proportional to 138.20, 190.64 and 98.33 is: 135.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.20 : 190.64 = 98.33 : x
  2. Step 2: Convert to fraction form
    138.20/190.64 = 98.33/x
  3. Step 3: Cross multiply
    138.20x = 190.64 × 98.33
  4. Step 4: Simplify right side
    138.20x = 18,745.14
  5. Step 5: Solve for x
    x = 18,745.14/138.20
  6. Step 6: Final answer
    x = 135.64

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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.