Solution:
Given data is 0.9:0.36 :: 10:4 are in proportion.
It can be written as,
HCF of each number in pairs is,
HCF of 90 and 36 = 3 3 2=18.
HCF is 18.
HCF is 2.
From above, (1)=(2).
The numbers are in proportion.
The given statement is true.
Therefore, option 1 is correct.