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Finding the Fourth Proportional to 127.36, 190.80 and 121.60

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Solution

The fourth proportional to 127.36, 190.80 and 121.60 is: 182.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.36 : 190.80 = 121.60 : x
  2. Step 2: Convert to fraction form
    127.36/190.80 = 121.60/x
  3. Step 3: Cross multiply
    127.36x = 190.80 × 121.60
  4. Step 4: Simplify right side
    127.36x = 23,201.28
  5. Step 5: Solve for x
    x = 23,201.28/127.36
  6. Step 6: Final answer
    x = 182.17

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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.