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Finding the Fourth Proportional to 209.00, 311.99 and 194.78

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Solution

The fourth proportional to 209.00, 311.99 and 194.78 is: 290.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.00 : 311.99 = 194.78 : x
  2. Step 2: Convert to fraction form
    209.00/311.99 = 194.78/x
  3. Step 3: Cross multiply
    209.00x = 311.99 × 194.78
  4. Step 4: Simplify right side
    209.00x = 60,769.22
  5. Step 5: Solve for x
    x = 60,769.22/209.00
  6. Step 6: Final answer
    x = 290.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.