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Finding the Fourth Proportional to 126.56, 190.82 and 121.16

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Solution

The fourth proportional to 126.56, 190.82 and 121.16 is: 182.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.56 : 190.82 = 121.16 : x
  2. Step 2: Convert to fraction form
    126.56/190.82 = 121.16/x
  3. Step 3: Cross multiply
    126.56x = 190.82 × 121.16
  4. Step 4: Simplify right side
    126.56x = 23,119.75
  5. Step 5: Solve for x
    x = 23,119.75/126.56
  6. Step 6: Final answer
    x = 182.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.