Check whether the following are in proportion or not :
(i) 2,4,6,8 (ii) 12, 18, 10 ,15

Explanation

To determine if the given sets of numbers are in proportion, we will use the property that states: two ratios \( a:b \) and \( c:d \) are in proportion if the product of the extremes is equal to the product of the means. This means we need to check if \( a \times d = b \times c \).

Let's solve the problem step by step.

### Step 1: Check the first set of numbers (2, 4, 6, 8)

1. Identify the numbers:
- First number (a) = 2
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