To solve the problem of John's running time for 4 km using the fundamental rule of proportionality, we can set up a proportion as follows:
1 km / 12 minutes = 4 km / x minutes
where x is the time it would take for John to run 4 km.
Using the fundamental rule of proportionality, we can cross-multiply to solve for x:
1 km * x minutes = 12 minutes * 4 km
x = (12 minutes * 4 km) / 1 km
x = 48 minutes
Therefore, according to the fundamental rule of proportionality, it would take John 48 minutes to run 4 km.
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To solve the problem of John's running time for 4 km using the fundamental rule of proportionality, we can set up a proportion as follows:
1 km / 12 minutes = 4 km / x minutes
where x is the time it would take for John to run 4 km.
Using the fundamental rule of proportionality, we can cross-multiply to solve for x:
1 km * x minutes = 12 minutes * 4 km
x = (12 minutes * 4 km) / 1 km
x = 48 minutes
Therefore, according to the fundamental rule of proportionality, it would take John 48 minutes to run 4 km.