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Finding the Fourth Proportional to 146.37, 201.90 and 121.80

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Solution

The fourth proportional to 146.37, 201.90 and 121.80 is: 168.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.37 : 201.90 = 121.80 : x
  2. Step 2: Convert to fraction form
    146.37/201.90 = 121.80/x
  3. Step 3: Cross multiply
    146.37x = 201.90 × 121.80
  4. Step 4: Simplify right side
    146.37x = 24,591.42
  5. Step 5: Solve for x
    x = 24,591.42/146.37
  6. Step 6: Final answer
    x = 168.01

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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.