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Finding the Fourth Proportional to 209.55, 313.50 and 137.55

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Solution

The fourth proportional to 209.55, 313.50 and 137.55 is: 205.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.55 : 313.50 = 137.55 : x
  2. Step 2: Convert to fraction form
    209.55/313.50 = 137.55/x
  3. Step 3: Cross multiply
    209.55x = 313.50 × 137.55
  4. Step 4: Simplify right side
    209.55x = 43,121.93
  5. Step 5: Solve for x
    x = 43,121.93/209.55
  6. Step 6: Final answer
    x = 205.78

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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.