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Finding the Fourth Proportional to 201.39, 301.68 and 105

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Solution

The fourth proportional to 201.39, 301.68 and 105 is: 157.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.39 : 301.68 = 105 : x
  2. Step 2: Convert to fraction form
    201.39/301.68 = 105/x
  3. Step 3: Cross multiply
    201.39x = 301.68 × 105
  4. Step 4: Simplify right side
    201.39x = 31,676.40
  5. Step 5: Solve for x
    x = 31,676.40/201.39
  6. Step 6: Final answer
    x = 157.29

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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.