Consider the following proportion:
[tex]$
\frac{2}{7}=\frac{12}{x}
$[/tex]

Use cross products to write the equation: [tex]\(2x = 84\)[/tex].

What is the value of [tex]\(x\)[/tex]?



Answer :

To solve the given proportion [tex]\(\frac{2}{7} = \frac{12}{x}\)[/tex], we can use the method of cross multiplication. Cross multiplication allows us to eliminate the fractions by creating a single equation that we can solve for [tex]\(x\)[/tex].

Here are the steps:

1. Start with the given proportion:
[tex]\[ \frac{2}{7} = \frac{12}{x} \][/tex]

2. Cross multiply to set up an equation without fractions. This involves multiplying the numerator of each fraction by the denominator of the other fraction:
[tex]\[ 2 \cdot x = 7 \cdot 12 \][/tex]

3. Simplify the right side of the equation:
[tex]\[ 2x = 84 \][/tex]

4. To isolate [tex]\(x\)[/tex] and solve for it, divide both sides of the equation by 2:
[tex]\[ x = \frac{84}{2} \][/tex]

5. Perform the division:
[tex]\[ x = 42 \][/tex]

Therefore, the value of [tex]\(x\)[/tex] is [tex]\(42\)[/tex].