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Finding the Fourth Proportional to 127.21, 190.72 and 54

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Solution

The fourth proportional to 127.21, 190.72 and 54 is: 80.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.21 : 190.72 = 54 : x
  2. Step 2: Convert to fraction form
    127.21/190.72 = 54/x
  3. Step 3: Cross multiply
    127.21x = 190.72 × 54
  4. Step 4: Simplify right side
    127.21x = 10,298.88
  5. Step 5: Solve for x
    x = 10,298.88/127.21
  6. Step 6: Final answer
    x = 80.96

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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.