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Finding the Fourth Proportional to 306.15, 422.38 and 201.30

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Solution

The fourth proportional to 306.15, 422.38 and 201.30 is: 277.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.15 : 422.38 = 201.30 : x
  2. Step 2: Convert to fraction form
    306.15/422.38 = 201.30/x
  3. Step 3: Cross multiply
    306.15x = 422.38 × 201.30
  4. Step 4: Simplify right side
    306.15x = 85,021.98
  5. Step 5: Solve for x
    x = 85,021.98/306.15
  6. Step 6: Final answer
    x = 277.71

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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.