4km = 4000m = 400000cm
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To convert the units to the same measurement, we need to convert 1 km to cm. There are 100,000 cm in 1 km (1 km = 100,000 cm). Therefore, the ratio of 4 cm to 1 km is 4:100,000, or simply 4:100,000.
In 4,000 meters there are 400,000 cm.
1 km = 1000 metres and 1 metre = 100 cm so 1 km = 105 cm So 400 km = 4*107 cm.
2 cm = 150 km 4 cm = 300 km
4 kilometers=400,000 centimeters