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Finding the Fourth Proportional to 201.38, 302.05 and 77.94

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Solution

The fourth proportional to 201.38, 302.05 and 77.94 is: 116.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.38 : 302.05 = 77.94 : x
  2. Step 2: Convert to fraction form
    201.38/302.05 = 77.94/x
  3. Step 3: Cross multiply
    201.38x = 302.05 × 77.94
  4. Step 4: Simplify right side
    201.38x = 23,541.87
  5. Step 5: Solve for x
    x = 23,541.87/201.38
  6. Step 6: Final answer
    x = 116.91

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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.