Question

Solve the proportion : 4 / 5 = a / 16

Answer 1

4/5 = a/16

a = 4× 16 /5

a = 64/5 = 12.8

hope it helps you....

Answer 2

$\huge{ \underline{ \overline{ \mid{ \mathfrak{ \purple{ \: \: SOLUTION \: \: } \mid}}}}}$

$\: \: \: \: \: \: \: \: \: \: \mathtt{ \frac{4}{5} = \frac{a}{16} } \\ \\ \mathtt{\Longrightarrow \: a \times 5 = 4 \times 16 \: \: \: \: \: \: [By \: \: cross \: \: multiplication] } \\ \\ \mathtt{\Longrightarrow \: 5a = 64 } \\ \\ \mathtt{\Longrightarrow \: a = \frac{64}{5} } \\ \\ \mathtt{ \therefore \: \: \underline{ \: \: a = 12.8 \: \: }}$