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Formula
Simplify the proportional expression $-12 : \left( -4 \right)$
$3 : 1$
Simplify the proportional expression
$- 12 : - 4$
 Since all terms are negative, change them to positive numbers 
$\color{#FF6800}{ 12 } : - 4$
$12 : - 4$
 Since all terms are negative, change them to positive numbers 
$12 : \color{#FF6800}{ 4 }$
$\color{#FF6800}{ 12 } : \color{#FF6800}{ 4 }$
 The greatest common factor of all terms is $4$
$\color{#FF6800}{ 12 } : \color{#FF6800}{ 4 }$
$\color{#FF6800}{ 12 } : \color{#FF6800}{ 4 }$
 Divide by the greatest common factor of all terms 
$12 \div \color{#FF6800}{ 4 } : 4 \div \color{#FF6800}{ 4 }$
$\color{#FF6800}{ 12 } \color{#FF6800}{ \div } \color{#FF6800}{ 4 } : 4 \div 4$
 Divide $12$ by $4$
$\color{#FF6800}{ 3 } : 4 \div 4$
$3 : \color{#FF6800}{ 4 } \color{#FF6800}{ \div } \color{#FF6800}{ 4 }$
 If a certain expression is divided by the same expression, the value becomes 1 
$3 : \color{#FF6800}{ 1 }$
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