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Finding the Fourth Proportional to 209.18, 290.98 and 205.22

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Solution

The fourth proportional to 209.18, 290.98 and 205.22 is: 285.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.18 : 290.98 = 205.22 : x
  2. Step 2: Convert to fraction form
    209.18/290.98 = 205.22/x
  3. Step 3: Cross multiply
    209.18x = 290.98 × 205.22
  4. Step 4: Simplify right side
    209.18x = 59,714.92
  5. Step 5: Solve for x
    x = 59,714.92/209.18
  6. Step 6: Final answer
    x = 285.47

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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.