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Finding the Fourth Proportional to 201.78, 302.20 and 104.12

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Solution

The fourth proportional to 201.78, 302.20 and 104.12 is: 155.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.78 : 302.20 = 104.12 : x
  2. Step 2: Convert to fraction form
    201.78/302.20 = 104.12/x
  3. Step 3: Cross multiply
    201.78x = 302.20 × 104.12
  4. Step 4: Simplify right side
    201.78x = 31,465.06
  5. Step 5: Solve for x
    x = 31,465.06/201.78
  6. Step 6: Final answer
    x = 155.94

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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.