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Finding the Fourth Proportional to 138.21, 190.67 and 119.77

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Solution

The fourth proportional to 138.21, 190.67 and 119.77 is: 165.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.21 : 190.67 = 119.77 : x
  2. Step 2: Convert to fraction form
    138.21/190.67 = 119.77/x
  3. Step 3: Cross multiply
    138.21x = 190.67 × 119.77
  4. Step 4: Simplify right side
    138.21x = 22,836.55
  5. Step 5: Solve for x
    x = 22,836.55/138.21
  6. Step 6: Final answer
    x = 165.23

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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.