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Finding the Fourth Proportional to 201.36, 279.21 and 189.12

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Solution

The fourth proportional to 201.36, 279.21 and 189.12 is: 262.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.36 : 279.21 = 189.12 : x
  2. Step 2: Convert to fraction form
    201.36/279.21 = 189.12/x
  3. Step 3: Cross multiply
    201.36x = 279.21 × 189.12
  4. Step 4: Simplify right side
    201.36x = 52,804.20
  5. Step 5: Solve for x
    x = 52,804.20/201.36
  6. Step 6: Final answer
    x = 262.24

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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.