A 59-year-old man also lost his life in a similar manner in Jodhpur, according to the police.
Officials said that south-west monsoon has arrived in the state and heavy rainfall in south Rajasthan has affected the movement on the Mehsana-Palanpur railway route as well.
In Sawai Madhopur district, three young boys - Ketan Mali (13), Lavkush Mali (14) and Prem Singh Mali (15) died when they were taking bath in a nullah in Pemapura village late last night, a Gangapur City police official.
In another incident, a man - Professor Amarchand Rathi - was swept away in a nullah in Ratanada police station area of Jodhpur, the police said.
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Rathi's body was handed over to family members following post mortem, police said.
Heavy rainfall also affected the movement of trains in the state, officials said.
Abu road- Mehsana-Ahmedabad, Ajmer-Ahmedabad-Ajmer passenger trains were cancelled due to heavy rainfall on the Mehsana-Palapur railway route, senior railways PRO, Kamal Joshi said.
Various places across the state recorded rainfall ranging from 1 to 4 cm.
MeT officials have predicted rainfall at isolated places.