Step 1 :Set up a proportion using the given values in the first row and solve for D. The proportion is \(\frac{A}{B} = \frac{C}{D}\). Substitute the given values to get \(\frac{5.5}{2.75} = \frac{1.8333333333333335}{D}\). Solving for D gives \(D = 0.9166666666666667\) inches.
Step 2 :Convert the decimal to a fraction to get \(D = \frac{11}{12}\) inches.
Step 3 :Set up a proportion using the given values in the second row and solve for A. The proportion is \(\frac{A}{B} = \frac{C}{D}\). Substitute the given values to get \(\frac{A}{23.6} = \frac{23.4}{15.6}\). Solving for A gives \(A = 15.733333333333336\) cm.
Step 4 :The final answers are: For part (a), the value of D in inches is \(\boxed{\frac{11}{12}}\). For part (b), the value of A in cm is \(\boxed{15.73}\).