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Finding the Fourth Proportional to 149.05, 205.78 and 104.25

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Solution

The fourth proportional to 149.05, 205.78 and 104.25 is: 143.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.05 : 205.78 = 104.25 : x
  2. Step 2: Convert to fraction form
    149.05/205.78 = 104.25/x
  3. Step 3: Cross multiply
    149.05x = 205.78 × 104.25
  4. Step 4: Simplify right side
    149.05x = 21,452.30
  5. Step 5: Solve for x
    x = 21,452.30/149.05
  6. Step 6: Final answer
    x = 143.93

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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.