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Finding the Fourth Proportional to 201.90, 302.78 and 80.12

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Solution

The fourth proportional to 201.90, 302.78 and 80.12 is: 120.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.90 : 302.78 = 80.12 : x
  2. Step 2: Convert to fraction form
    201.90/302.78 = 80.12/x
  3. Step 3: Cross multiply
    201.90x = 302.78 × 80.12
  4. Step 4: Simplify right side
    201.90x = 24,258.73
  5. Step 5: Solve for x
    x = 24,258.73/201.90
  6. Step 6: Final answer
    x = 120.15

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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.