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Finding the Fourth Proportional to 209.37, 313.80 and 122.74

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Solution

The fourth proportional to 209.37, 313.80 and 122.74 is: 183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.37 : 313.80 = 122.74 : x
  2. Step 2: Convert to fraction form
    209.37/313.80 = 122.74/x
  3. Step 3: Cross multiply
    209.37x = 313.80 × 122.74
  4. Step 4: Simplify right side
    209.37x = 38,515.81
  5. Step 5: Solve for x
    x = 38,515.81/209.37
  6. Step 6: Final answer
    x = 183.96

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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.