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Finding the Fourth Proportional to 127.95, 190.78 and 121.11

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Solution

The fourth proportional to 127.95, 190.78 and 121.11 is: 180.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.95 : 190.78 = 121.11 : x
  2. Step 2: Convert to fraction form
    127.95/190.78 = 121.11/x
  3. Step 3: Cross multiply
    127.95x = 190.78 × 121.11
  4. Step 4: Simplify right side
    127.95x = 23,105.37
  5. Step 5: Solve for x
    x = 23,105.37/127.95
  6. Step 6: Final answer
    x = 180.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.