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Finding the Fourth Proportional to 138.36, 190.90 and 80.13

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Solution

The fourth proportional to 138.36, 190.90 and 80.13 is: 110.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.36 : 190.90 = 80.13 : x
  2. Step 2: Convert to fraction form
    138.36/190.90 = 80.13/x
  3. Step 3: Cross multiply
    138.36x = 190.90 × 80.13
  4. Step 4: Simplify right side
    138.36x = 15,295.46
  5. Step 5: Solve for x
    x = 15,295.46/138.36
  6. Step 6: Final answer
    x = 110.55

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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.