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Finding the Fourth Proportional to 127.68, 190.23 and 121.56

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Solution

The fourth proportional to 127.68, 190.23 and 121.56 is: 181.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.68 : 190.23 = 121.56 : x
  2. Step 2: Convert to fraction form
    127.68/190.23 = 121.56/x
  3. Step 3: Cross multiply
    127.68x = 190.23 × 121.56
  4. Step 4: Simplify right side
    127.68x = 23,124.36
  5. Step 5: Solve for x
    x = 23,124.36/127.68
  6. Step 6: Final answer
    x = 181.11

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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.