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Finding the Fourth Proportional to 201.38, 302.31 and 189.99

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Solution

The fourth proportional to 201.38, 302.31 and 189.99 is: 285.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.38 : 302.31 = 189.99 : x
  2. Step 2: Convert to fraction form
    201.38/302.31 = 189.99/x
  3. Step 3: Cross multiply
    201.38x = 302.31 × 189.99
  4. Step 4: Simplify right side
    201.38x = 57,435.88
  5. Step 5: Solve for x
    x = 57,435.88/201.38
  6. Step 6: Final answer
    x = 285.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.