Question

the first three terms of proportion are 3,5,21 then fourth tem is ​

Answer 1

Answer:

35

Step-by-step explanation:

3:5::21:x

$\frac{3}{5} = \frac{21}{x} \\ 3 \times x = 5 \times 21 \\ 3x = 105 \\ x = \frac{105}{3} \\ x = 35$