Question

3:8::21:x find the x?

Answer 1

Answer:

56

Hope it helps u

Answer 2

Given :

• 3:8 :: 21:x

To Find :

• Value of x = ?

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SolutioN : We Should remeber that the numbers in proportion can be written in the form of fraction . Let's Solve :

☆ Calculating the Value of x :

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { \dfrac{3}{8} = \dfrac{21}{x} } \\ \\ \\ \end{gathered}$

• Cross Multiplying the Values :

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { x \times 3 = 8 \times 21 } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { 3x = 8 \times 21 } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { 3x = 168 } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { x = \dfrac{168}{3} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \longrightarrow \; \; \sf { x = \cancel\dfrac{168}{3} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \longrightarrow \; \; {\underline{\boxed{\pmb{\sf { x = 56 }}}}} \; {\purple{\pmb{\bigstar}}} \\ \\ \\ \end{gathered}$

$\therefore \;$ Value of x is 56 .

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