68 : 130 : : ? : 350       

First Row: Numbers in sequence

• 68
• 130
• 222 (underlined)
• 350
•  

Second Row: Mathematical expressions showing the pattern

• 4³ + 4 = 64 + 4 = 68
• 5³ + 5 = 125 + 5 = 130
• 6³ + 6 = 216 + 6 = 222
• 7³ + 7 = 343 + 7 = 350
•  

Formula: n³ + n

Where n represents consecutive integers starting from 4.

Notation:

• : (single colon) - represents a ratio or proportion relationship
• :: (double colon) - represents "as" or "is to" in proportion notation

This notation format (a : b :: c : d) is read as "a is to b as c is to d"

Key Observation:

The number 222 is underlined in the original image, possibly indicating it as the answer or focus of the pattern.