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Finding the Fourth Proportional to 127.21, 190.58 and 81.44

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Solution

The fourth proportional to 127.21, 190.58 and 81.44 is: 122.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.21 : 190.58 = 81.44 : x
  2. Step 2: Convert to fraction form
    127.21/190.58 = 81.44/x
  3. Step 3: Cross multiply
    127.21x = 190.58 × 81.44
  4. Step 4: Simplify right side
    127.21x = 15,520.73
  5. Step 5: Solve for x
    x = 15,520.73/127.21
  6. Step 6: Final answer
    x = 122.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.