The rupee strengthened for the third straight session on Friday and closed 15 paise higher at 72.45 (provisional) against the US dollar, tracking positive domestic equities.

At the interbank forex market, the local unit opened at 72.46 against the greenback and witnessed an intra-day high of 72.31 and a low of 72.49 during the session.

It finally ended at 72.45 against the American currency, registering a rise of 15 paise over its previous close.

On Thursday, the rupee had settled at 72.60 against the US dollar.

In the last three trading sessions, the rupee has appreciated by 51 paise.

Meanwhile, the dollar index, which gauges the greenback's strength against a basket of six currencies, rose 0.14 per cent to 90.09.