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Finding the Fourth Proportional to 685.20, 1,027.72 and 198.25

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Solution

The fourth proportional to 685.20, 1,027.72 and 198.25 is: 297.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.20 : 1,027.72 = 198.25 : x
  2. Step 2: Convert to fraction form
    685.20/1,027.72 = 198.25/x
  3. Step 3: Cross multiply
    685.20x = 1,027.72 × 198.25
  4. Step 4: Simplify right side
    685.20x = 203,745.49
  5. Step 5: Solve for x
    x = 203,745.49/685.20
  6. Step 6: Final answer
    x = 297.35

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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.