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Finding the Fourth Proportional to 209.54, 314.81 and 163.78

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Solution

The fourth proportional to 209.54, 314.81 and 163.78 is: 246.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.54 : 314.81 = 163.78 : x
  2. Step 2: Convert to fraction form
    209.54/314.81 = 163.78/x
  3. Step 3: Cross multiply
    209.54x = 314.81 × 163.78
  4. Step 4: Simplify right side
    209.54x = 51,559.58
  5. Step 5: Solve for x
    x = 51,559.58/209.54
  6. Step 6: Final answer
    x = 246.06

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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.