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Finding the Fourth Proportional to 127.21, 190.79 and 55.08

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Solution

The fourth proportional to 127.21, 190.79 and 55.08 is: 82.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.21 : 190.79 = 55.08 : x
  2. Step 2: Convert to fraction form
    127.21/190.79 = 55.08/x
  3. Step 3: Cross multiply
    127.21x = 190.79 × 55.08
  4. Step 4: Simplify right side
    127.21x = 10,508.44
  5. Step 5: Solve for x
    x = 10,508.44/127.21
  6. Step 6: Final answer
    x = 82.61

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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.