Question

What is the missing value in the proportion 4/5 = x/30?

Answer 1

Answer:

$\displaystyle x = 24$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right  

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtraction Property of Equality

Step-by-step explanation:

Step 1: Define

$\displaystyle \frac{4}{5} = \frac{x}{30}$

Step 2: Solve for x

1. [Multiplication Property of Equality] Cross-multiply:                                      $\displaystyle 5x = 120$
2. [Division Property of Equality] Divide 5 on both sides:                                $\displaystyle x = 24$