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Finding the Fourth Proportional to 201.40, 279.20 and 190.45

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Solution

The fourth proportional to 201.40, 279.20 and 190.45 is: 264.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.40 : 279.20 = 190.45 : x
  2. Step 2: Convert to fraction form
    201.40/279.20 = 190.45/x
  3. Step 3: Cross multiply
    201.40x = 279.20 × 190.45
  4. Step 4: Simplify right side
    201.40x = 53,173.64
  5. Step 5: Solve for x
    x = 53,173.64/201.40
  6. Step 6: Final answer
    x = 264.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.