Why external data expands analysis in Google Sheets - Formula Trace Breakdown

Sample Data

Sales data by product and region in columns A-C. External data with region population in columns E-F.

Cell	Value
A1	Product
B1	Sales
C1	Region
A2	Apples
B2	100
C2	North
A3	Bananas
B3	150
C3	South
A4	Cherries
B4	200
C4	East
E1	Region
F1	Population
E2	North
F2	50000
E3	South
F3	70000
E4	East
F4	60000

Formula Trace

=B2 * VLOOKUP(C2, E2:F4, 2, FALSE)

Step 1: VLOOKUP(C2, E2:F4, 2, FALSE)

Step 2: B2 * 50000

Step 3: 100 * 50000

Cell Reference Map

    A       B       C       D       E       F
1 |Product| Sales |Region |       |Region |Population|
2 |Apples |  100  | North |       | North |  50000  |
3 |Bananas|  150  | South |       | South |  70000  |
4 |Cherries| 200  | East  |       | East  |  60000  |

Formula uses sales in B2 and region in C2 to look up population in external data range E2:F4.

Result

    A       B       C       D       E       F       G
1 |Product| Sales |Region |       |Region |Population|Result   |
2 |Apples |  100  | North |       | North |  50000  |5000000  |
3 |Bananas|  150  | South |       | South |  70000  |         |
4 |Cherries| 200  | East  |       | East  |  60000  |         |

The result in G2 shows the expanded analysis by multiplying sales with external population data.

Sheet Trace Quiz - 3 Questions

What does the VLOOKUP function do in the formula?

A Adds sales and population values

B Multiplies sales by region code

C Finds the population for the region in C2 from the external data

D Returns the sales value from B2

Key Result

Use VLOOKUP to find matching data in an external range and combine it with local data for deeper analysis.