The Standard Model (SM) of particle physics is the most precise theory describing elementary particles and their interactions. Nevertheless, it does not address several fundamental issues, such as the gauge hierarchy problem, the quantization of gravity, and cosmological observations including dark matter, baryogenesis, and inflation. Understanding possible extensions of the SM that can be tested through precision observables is therefore a central problem in particle physics. Many extensions of the SM introduce additional quarks and leptons that are vector-like under the SM gauge group.In this project, we investigated the impact of chiral enhancement induced by vector-like fourth-family quarks on flavor-violating processes. In the SM, chiral enhancement plays an important role in processes proportional to internal quark masses. The presence of additional heavy fermions can therefore lead to sizable deviations from SM predictions.We derived the couplings of quarks to the electroweak gauge bosons in the presence of vector-like fourth-family quarks and performed a systematic analysis of the loop diagrams relevant to the radiative decay of a bottom quark into a strange quark and a photon. We obtained analytical expressions that consistently include the chiral enhancement effects from the fourth-family vector-like quarks. We also demonstrated that gauge invariance is preserved once the corresponding bosonic self-energy contributions are properly taken into account. Furthermore, we clarified that these enhanced effects arise only when both electroweak singlet and doublet vector-like quarks are introduced as a fourth family.We quantitatively evaluated the resulting deviations of the branching fraction from the SM prediction and found that the chiral enhancement can generate effects potentially accessible to future precision measurements of B-meson decays. To understand the qualitative behavior, we also derived approximate formulae valid in the heavy-mass and small-mixing limit of the fourth family. A manuscript summarizing these results is currently on arXiv 2603.24267 [hep-ph], and will be submitted to a journal soon. These results provide a framework for probing vector-like quark scenarios through precision flavor experiments and will be extended to include broader classes of observables in future work.