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Finding the Fourth Proportional to 209.00, 313.54 and 205.72

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Solution

The fourth proportional to 209.00, 313.54 and 205.72 is: 308.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.00 : 313.54 = 205.72 : x
  2. Step 2: Convert to fraction form
    209.00/313.54 = 205.72/x
  3. Step 3: Cross multiply
    209.00x = 313.54 × 205.72
  4. Step 4: Simplify right side
    209.00x = 64,500.15
  5. Step 5: Solve for x
    x = 64,500.15/209.00
  6. Step 6: Final answer
    x = 308.61

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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.