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You got a 6 Volt battery, and have to design a voltage divider using 1 ohm resistors to achive an voltage of 4 volts. I get the answer to be three with trial and error, but there must be a proper approach to the question?

A 2.8 kiloohm and a 2.1 kiloohm resistor are connected parallel, this combination is connected in series with a 1.8 kiloohm resistor. if each resistor is rated at 0.5 W, what is the maximum voltage that can be passed across the network?

I get the combined resistance to 3 kiloohms. But then using R = V^2 / P i don't get the correct voltage. Why?