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Finding the Fourth Proportional to 146.28, 201.36 and 121.78

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Solution

The fourth proportional to 146.28, 201.36 and 121.78 is: 167.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.28 : 201.36 = 121.78 : x
  2. Step 2: Convert to fraction form
    146.28/201.36 = 121.78/x
  3. Step 3: Cross multiply
    146.28x = 201.36 × 121.78
  4. Step 4: Simplify right side
    146.28x = 24,522.33
  5. Step 5: Solve for x
    x = 24,522.33/146.28
  6. Step 6: Final answer
    x = 167.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.