If the city of miami is 1.83 meters above sea level, how many years of steady sea-level rise at 4 mm/year will flood the city?

Proportion states that the ratios or fractions are equal

Use conversion:

1 mm  =0.001 m

As per the statement:

If the city of Miami is 1.83 meters above sea level.

Also,

Sea level rises in 1 year = 4 mm = 0.004 m

Let x be the years of steady sea level.

then by definition of proportion:

by Cross multiply we get;

Divide both sides by 0.004 we get;

457.5 = x

Therefore, 457.5 years of steady sea level rise at 4 mm/ year will flood the city