To determine which statements are true using rational approximations, let's evaluate each expression:
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\( \sqrt{49} > 7 \): This is false, because \( \sqrt{49} = 7 \).
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\( \sqrt{48} < \sqrt{36} \): This is false because \( \sqrt{48} \approx 6.93 \) and \( \sqrt{36} = 6 \). Therefore, \( \sqrt{48} > \sqrt{36} \).
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\( \sqrt{48} > \sqrt{36} \): This is true because \( \sqrt{48} \approx 6.93 \) and \( \sqrt{36} = 6\).
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\( \sqrt{49} < 7 \): This is false, because \( \sqrt{49} = 7 \).
From these evaluations, we conclude that the only true statement is:
\( \sqrt{48} > \sqrt{36} \).