The inequality for the product of 3.6 and an unknown number (x) that is greater than 18 is x > 5.
To write an inequality for the product of 3.6 and an unknown number that is greater than 18, we can use the symbol for "greater than" (>).
Let's assume the unknown number is represented by the variable "x". We can now write the inequality as:
3.6 * x > 18
This means that the product of 3.6 and the unknown number (x) is greater than 18.
To solve this inequality for x, we can divide both sides of the inequality by 3.6. This will give us:
x > 18 / 3.6
Simplifying further, we have:
x > 5
So, any value of x that is greater than 5 will satisfy the inequality. For example, if x = 6, the inequality is true since 3.6 * 6 = 21.6, which is greater than 18.