<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />

# Proportions to Find Base b

## Cross - multiply to find a missing part of a proportion, base, b.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Find the Whole Given the Percents and Parts - Overview

by CK-12 //basic

Overview

0
• Video

## Example 2: Solve a Percent Problem with a Percent Proportion

by CK-12 //basic

Goes through the steps of solving 36 is 15% of what number using a percent proportion.

0
• Video

## Find the Whole Given the Percents and Parts - Example 1

by CK-12 //basic

Whole number percentage calculations - without units

0
• Video

## Find the Whole Given the Percents and Parts - Example 2

by CK-12 //basic

Whole number percentage calculations - with units

0
• Video

## Find the Whole Given the Percents and Parts - Example 3

by CK-12 //basic

Whole number percentage calculations - with compound units

0
• Video

## Find the Whole Given the Percents and Parts - Example 4

by CK-12 //basic

Decimal percentage calculations - without units

0
• Video

## Find the Whole Given the Percents and Parts - Example 5

by CK-12 //basic

Decimal percentage calculations - with units

0
• Video

## Find the Whole Given the Percents and Parts - Example 6

by CK-12 //basic

Percentage calculation - one-step word problems

0
• Video

## Find the Whole Given the Percents and Parts - Example 7

by CK-12 //basic

Percentage calculation - two-step word problems

0
• Video

## Find the Whole Given the Percents and Parts - Example 8

by CK-12 //basic

Percentage calculation - multi-step word problems

0