Let’s write that relationship as a formula:

p = k x (1 / r^2)

Where k is the proportion constant we need to find.

When p=5 and r=2, let’s find out what k is:

5 = k x ( 1 / 2^2)

5 = k x ( 1 / 4)

5 * 4 = k

k = 20

Now that we know what k is, let’s rewrite that formula:

P = 20 x (1 / r^2)

Now let’s find p when r is 5.

P = 20 x (1 / 5^2)

p = 20 x (1 / 25)

p = 20 / 25 (now lets simplify more)

p... more

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