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Finding the Fourth Proportional to 209.40, 290.28 and 198.44

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Solution

The fourth proportional to 209.40, 290.28 and 198.44 is: 275.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.40 : 290.28 = 198.44 : x
  2. Step 2: Convert to fraction form
    209.40/290.28 = 198.44/x
  3. Step 3: Cross multiply
    209.40x = 290.28 × 198.44
  4. Step 4: Simplify right side
    209.40x = 57,603.16
  5. Step 5: Solve for x
    x = 57,603.16/209.40
  6. Step 6: Final answer
    x = 275.09

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.