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Finding the Fourth Proportional to 127.25, 190.90 and 55.11

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Solution

The fourth proportional to 127.25, 190.90 and 55.11 is: 82.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.25 : 190.90 = 55.11 : x
  2. Step 2: Convert to fraction form
    127.25/190.90 = 55.11/x
  3. Step 3: Cross multiply
    127.25x = 190.90 × 55.11
  4. Step 4: Simplify right side
    127.25x = 10,520.71
  5. Step 5: Solve for x
    x = 10,520.71/127.25
  6. Step 6: Final answer
    x = 82.68

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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.